fixed glow + dimming

src/glyph_shader.wgsl

@@ -219,6 +219,43 @@ const CURSOR_BLOCK: u32 = 0u;
 const CURSOR_UNDERLINE: u32 = 1u;
 const CURSOR_BAR: u32 = 2u;
 
+// Check if a cell is within the selection range
+// Selection is specified as (start_col, start_row) to (end_col, end_row), normalized
+// so start <= end in reading order
+fn is_cell_selected(col: u32, row: u32) -> bool {
+    // Check if selection is active (-1 values mean no selection)
+    if grid_params.selection_start_col < 0 || grid_params.selection_start_row < 0 {
+        return false;
+    }
+    
+    let sel_start_col = u32(grid_params.selection_start_col);
+    let sel_start_row = u32(grid_params.selection_start_row);
+    let sel_end_col = u32(grid_params.selection_end_col);
+    let sel_end_row = u32(grid_params.selection_end_row);
+    
+    // Check if cell is within row range
+    if row < sel_start_row || row > sel_end_row {
+        return false;
+    }
+    
+    // Single row selection
+    if sel_start_row == sel_end_row {
+        return col >= sel_start_col && col <= sel_end_col;
+    }
+    
+    // Multi-row selection
+    if row == sel_start_row {
+        // First row: from start_col to end of line
+        return col >= sel_start_col;
+    } else if row == sel_end_row {
+        // Last row: from start of line to end_col
+        return col <= sel_end_col;
+    } else {
+        // Middle rows: entire row is selected
+        return true;
+    }
+}
+
 // Vertex output for instanced cell rendering
 struct CellVertexOutput {
     @builtin(position) clip_position: vec4<f32>,
@@ -327,8 +364,8 @@ fn vs_cell_bg(
         bg = tmp;
     }
     
-    // Check if this cell is selected (per-cell flag set by CPU, respects xlimit)
+    // Check if this cell is selected using GridParams selection range
-    let is_selected = (attrs & ATTR_SELECTED_BIT) != 0u;
+    let is_selected = is_cell_selected(col, row);
     if is_selected {
         fg = vec4<f32>(0.0, 0.0, 0.0, 1.0);  // Black foreground
         bg = vec4<f32>(1.0, 1.0, 1.0, 1.0);  // White background
@@ -346,9 +383,18 @@ fn vs_cell_bg(
         bg.a = 0.0;
     }
     
-    // Calculate cursor color - use fg color (inverted from bg) for visibility
+    // Calculate cursor color
-    // For block cursor, we'll use fg as the cursor background
+    // If the cell is empty (no glyph), use default foreground color for cursor
-    var cursor_color = fg;
+    // Otherwise use the cell's foreground color
+    var cursor_color: vec4<f32>;
+    let sprite_idx = cell.sprite_idx & ~COLORED_GLYPH_FLAG;
+    if sprite_idx == 0u {
+        // Empty cell - use default foreground color for cursor
+        cursor_color = color_table.colors[256]; // default_fg
+    } else {
+        // Cell has a glyph - use its foreground color
+        cursor_color = fg;
+    }
     cursor_color.a = 1.0;
     
     var out: CellVertexOutput;
@@ -444,8 +490,8 @@ fn vs_cell_glyph(
         bg = tmp;
     }
     
-    // Check if this cell is selected (per-cell flag set by CPU, respects xlimit)
+    // Check if this cell is selected using GridParams selection range
-    let is_selected = (attrs & ATTR_SELECTED_BIT) != 0u;
+    let is_selected = is_cell_selected(col, row);
     if is_selected {
         fg = vec4<f32>(0.0, 0.0, 0.0, 1.0);  // Black foreground
         bg = vec4<f32>(1.0, 1.0, 1.0, 1.0);  // White background

src/main.rs

@@ -270,19 +270,23 @@ impl Pane {
     /// Create a new pane with its own terminal and PTY.
     fn new(cols: usize, rows: usize, scrollback_lines: usize) -> Result<Self, String> {
         let terminal = Terminal::new(cols, rows, scrollback_lines);
-        let pty = Pty::spawn(None).map_err(|e| format!("Failed to spawn PTY: {}", e))?;
         
-        // Set terminal size (use default cell size estimate for initial pixel dimensions)
+        // Calculate pixel dimensions (use default cell size estimate)
         let default_cell_width = 10u16;
         let default_cell_height = 20u16;
-        if let Err(e) = pty.resize(
+        let width_px = cols as u16 * default_cell_width;
+        let height_px = rows as u16 * default_cell_height;
+        
+        // Spawn PTY with initial size - this sets the size BEFORE forking,
+        // so the shell inherits the correct terminal dimensions immediately.
+        // This prevents race conditions where .zshrc runs before resize().
+        let pty = Pty::spawn(
+            None, 
             cols as u16, 
             rows as u16, 
-            cols as u16 * default_cell_width,
+            width_px, 
-            rows as u16 * default_cell_height,
+            height_px
-        ) {
+        ).map_err(|e| format!("Failed to spawn PTY: {}", e))?;
-            log::warn!("Failed to set initial PTY size: {}", e);
-        }
         
         let pty_fd = pty.as_raw_fd();
         
@@ -302,12 +306,20 @@ impl Pane {
     }
     
     /// Resize the terminal and PTY.
+    /// Only sends SIGWINCH to the PTY if the size actually changed.
     fn resize(&mut self, cols: usize, rows: usize, width_px: u16, height_px: u16) {
+        // Check if size actually changed before sending SIGWINCH
+        // This prevents spurious signals that can interrupt programs like fastfetch
+        let size_changed = cols != self.terminal.cols || rows != self.terminal.rows;
+        
         self.terminal.resize(cols, rows);
+        
+        if size_changed {
             if let Err(e) = self.pty.resize(cols as u16, rows as u16, width_px, height_px) {
                 log::warn!("Failed to resize PTY: {}", e);
             }
         }
+    }
     
     /// Write data to the PTY.
     fn write_to_pty(&mut self, data: &[u8]) {
@@ -439,17 +451,19 @@ impl SplitNode {
                 // Calculate how many cells fit
                 let cols = (width / cell_width).floor() as usize;
                 let rows = (height / cell_height).floor() as usize;
-                // Store actual cell-aligned dimensions (not allocated space)
+                // Store the full allocated dimensions (not just cell-aligned)
-                let actual_width = cols.max(1) as f32 * cell_width;
+                // This ensures edge glow and pane dimming cover the full pane area
-                let actual_height = rows.max(1) as f32 * cell_height;
                 *geometry = PaneGeometry {
                     x,
                     y,
-                    width: actual_width,
+                    width,   // Full allocated width
-                    height: actual_height,
+                    height,  // Full allocated height
                     cols: cols.max(1),
                     rows: rows.max(1),
                 };
+                // Return cell-aligned dimensions for layout calculations
+                let actual_width = cols.max(1) as f32 * cell_width;
+                let actual_height = rows.max(1) as f32 * cell_height;
                 (actual_width, actual_height)
             }
             SplitNode::Split { horizontal, ratio, first, second } => {
@@ -1954,14 +1968,17 @@ impl App {
         
         if !navigated {
             // No neighbor in that direction - trigger edge glow animation
-            // Add to existing glows (don't replace) so multiple can be visible
+            // Use renderer's helper to calculate proper screen-space glow bounds
-            if let Some(geom) = active_pane_geom {
+            if let (Some(geom), Some(renderer)) = (active_pane_geom, &self.renderer) {
+                let (glow_x, glow_y, glow_width, glow_height) = 
+                    renderer.calculate_edge_glow_bounds(geom.x, geom.y, geom.width, geom.height);
+                
                 self.edge_glows.push(EdgeGlow::new(
                     direction,
-                    geom.x,
+                    glow_x,
-                    geom.y,
+                    glow_y,
-                    geom.width,
+                    glow_width,
-                    geom.height,
+                    glow_height,
                 ));
             }
         }
@@ -2380,6 +2397,7 @@ impl ApplicationHandler<UserEvent> for App {
                                     let scroll_offset = self.get_scroll_offset();
                                     let content_row = screen_row as isize - scroll_offset as isize;
                                     let pos = CellPosition { col, row: content_row };
+                                    log::debug!("Selection started at col={}, content_row={}, screen_row={}, scroll_offset={}", col, content_row, screen_row, scroll_offset);
                                     if let Some(tab) = self.active_tab_mut() {
                                         if let Some(pane) = tab.active_pane_mut() {
                                             pane.selection = Some(Selection { start: pos, end: pos });
@@ -2505,8 +2523,13 @@ impl ApplicationHandler<UserEvent> for App {
                                 
                                 // Convert selection to screen coords for this pane
                                 let selection = if is_active {
-                                    pane.selection.as_ref()
+                                    let sel = pane.selection.as_ref()
-                                        .and_then(|sel| sel.to_screen_coords(scroll_offset, geom.rows))
+                                        .and_then(|sel| sel.to_screen_coords(scroll_offset, geom.rows));
+                                    if pane.selection.is_some() {
+                                        log::debug!("Render: pane.selection={:?}, scroll_offset={}, rows={}, screen_coords={:?}", 
+                                            pane.selection, scroll_offset, geom.rows, sel);
+                                    }
+                                    sel
                                 } else {
                                     None
                                 };

src/pty.rs

@@ -35,7 +35,8 @@ pub struct Pty {
 
 impl Pty {
     /// Creates a new PTY and spawns a shell process.
-    pub fn spawn(shell: Option<&str>) -> Result<Self, PtyError> {
+    /// The initial terminal size should be provided so the shell starts with the correct dimensions.
+    pub fn spawn(shell: Option<&str>, cols: u16, rows: u16, xpixel: u16, ypixel: u16) -> Result<Self, PtyError> {
         // Open the PTY master
         let master = openpt(OpenptFlags::RDWR | OpenptFlags::NOCTTY | OpenptFlags::CLOEXEC)
             .map_err(PtyError::OpenMaster)?;
@@ -50,6 +51,21 @@ impl Pty {
         // Get the slave name
         let slave_name = ptsname(&master, Vec::new()).map_err(PtyError::PtsName)?;
         
+        // Set the terminal size BEFORE forking so the child inherits the correct size.
+        // This prevents race conditions where the shell's .zshrc runs before the parent
+        // can call resize(), causing programs like fastfetch to get wrong dimensions.
+        let winsize = libc::winsize {
+            ws_row: rows,
+            ws_col: cols,
+            ws_xpixel: xpixel,
+            ws_ypixel: ypixel,
+        };
+        let fd = std::os::fd::AsRawFd::as_raw_fd(&master);
+        let result = unsafe { libc::ioctl(fd, libc::TIOCSWINSZ, &winsize) };
+        if result == -1 {
+            return Err(PtyError::Io(std::io::Error::last_os_error()));
+        }
+
         // Fork the process
         // SAFETY: We're careful to only use async-signal-safe functions in the child
         let fork_result = unsafe { libc::fork() };

src/renderer.rs

@@ -786,6 +786,10 @@ pub struct Renderer {
     
     /// GPU quads for overlay rendering (rendered on top of everything).
     overlay_quads: Vec<Quad>,
+    /// GPU buffer for overlay quad instances (separate from main quads).
+    overlay_quad_buffer: wgpu::Buffer,
+    /// Bind group for overlay quad rendering.
+    overlay_quad_bind_group: wgpu::BindGroup,
 }
 
 // ═══════════════════════════════════════════════════════════════════════════════
@@ -2747,6 +2751,30 @@ impl Renderer {
             ],
         });
         
+        // Overlay quad buffer for instance data (separate from main quads)
+        let overlay_quad_buffer = device.create_buffer(&wgpu::BufferDescriptor {
+            label: Some("Overlay Quad Buffer"),
+            size: (max_quads * std::mem::size_of::<Quad>()) as u64,
+            usage: wgpu::BufferUsages::STORAGE | wgpu::BufferUsages::COPY_DST,
+            mapped_at_creation: false,
+        });
+        
+        // Bind group for overlay quad rendering (uses same params buffer but different quad buffer)
+        let overlay_quad_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: Some("Overlay Quad Bind Group"),
+            layout: &quad_bind_group_layout,
+            entries: &[
+                wgpu::BindGroupEntry {
+                    binding: 0,
+                    resource: quad_params_buffer.as_entire_binding(),
+                },
+                wgpu::BindGroupEntry {
+                    binding: 1,
+                    resource: overlay_quad_buffer.as_entire_binding(),
+                },
+            ],
+        });
+        
         // Pipeline layout for quad rendering
         let quad_pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
             label: Some("Quad Pipeline Layout"),
@@ -2890,6 +2918,8 @@ impl Renderer {
             quad_pipeline,
             quad_bind_group,
             overlay_quads: Vec::with_capacity(32),
+            overlay_quad_buffer,
+            overlay_quad_bind_group,
         }
     }
 
@@ -2992,6 +3022,120 @@ impl Renderer {
         (available_height - used_height) / 2.0
     }
 
+    /// Calculates screen-space bounds for edge glow given pane geometry.
+    /// Takes pane coordinates in grid-relative space and transforms them to screen coordinates,
+    /// extending to fill the terminal grid area (but not into tab bar or statusline).
+    /// Returns (screen_x, screen_y, width, height) for the glow mask area.
+    pub fn calculate_edge_glow_bounds(&self, pane_x: f32, pane_y: f32, pane_width: f32, pane_height: f32) -> (f32, f32, f32, f32) {
+        let grid_x_offset = self.grid_x_offset();
+        let grid_y_offset = self.grid_y_offset();
+        let terminal_y_offset = self.terminal_y_offset();
+        let (available_width, available_height) = self.available_grid_space();
+        
+        // Calculate the terminal grid area boundaries in screen coordinates
+        // This is the area where content is rendered, excluding tab bar and statusline
+        let grid_top = terminal_y_offset;
+        let grid_bottom = terminal_y_offset + available_height;
+        let grid_left = 0.0_f32;
+        let grid_right = self.width as f32;
+        
+        log::debug!("calculate_edge_glow_bounds: pane=({}, {}, {}, {})", pane_x, pane_y, pane_width, pane_height);
+        log::debug!("  grid area: top={}, bottom={}, left={}, right={}", grid_top, grid_bottom, grid_left, grid_right);
+        log::debug!("  offsets: grid_x={}, grid_y={}, terminal_y={}", grid_x_offset, grid_y_offset, terminal_y_offset);
+        
+        // Transform pane coordinates to screen space (same as border rendering)
+        let mut screen_x = grid_x_offset + pane_x;
+        let mut screen_y = terminal_y_offset + grid_y_offset + pane_y;
+        let mut width = pane_width;
+        let mut height = pane_height;
+        
+        log::debug!("  initial screen: ({}, {}, {}, {})", screen_x, screen_y, width, height);
+        
+        // Use a larger epsilon to account for cell-alignment gaps in split panes
+        // With cell-aligned splits, gaps can be up to one cell height
+        let epsilon = self.cell_height.max(self.cell_width);
+        
+        // Left edge at screen boundary - extend to screen left edge
+        if pane_x < epsilon {
+            width += screen_x - grid_left;
+            screen_x = grid_left;
+        }
+        
+        // Right edge at screen boundary - extend to screen right edge
+        if (pane_x + pane_width) >= available_width - epsilon {
+            width = grid_right - screen_x;
+        }
+        
+        // Top edge at grid boundary - extend to grid top (respects tab bar/statusline at top)
+        if pane_y < epsilon {
+            height += screen_y - grid_top;
+            screen_y = grid_top;
+        }
+        
+        // Bottom edge at grid boundary - extend to grid bottom (respects tab bar/statusline at bottom)
+        if (pane_y + pane_height) >= available_height - epsilon {
+            height = grid_bottom - screen_y;
+        }
+        
+        log::debug!("  final screen: ({}, {}, {}, {})", screen_x, screen_y, width, height);
+        
+        (screen_x, screen_y, width, height)
+    }
+
+    /// Calculates screen-space bounds for dim overlay given pane geometry.
+    /// Takes pane coordinates in grid-relative space and transforms them to screen coordinates,
+    /// extending to fill the terminal grid area (but not into tab bar or statusline).
+    /// This is identical to calculate_edge_glow_bounds - ensures dim overlays cover the full
+    /// pane area including centering margins, matching edge glow behavior.
+    /// Returns (screen_x, screen_y, width, height) for the overlay area.
+    pub fn calculate_dim_overlay_bounds(&self, pane_x: f32, pane_y: f32, pane_width: f32, pane_height: f32) -> (f32, f32, f32, f32) {
+        let grid_x_offset = self.grid_x_offset();
+        let grid_y_offset = self.grid_y_offset();
+        let terminal_y_offset = self.terminal_y_offset();
+        let (available_width, available_height) = self.available_grid_space();
+        
+        // Calculate the terminal grid area boundaries in screen coordinates
+        // This is the area where content is rendered, excluding tab bar and statusline
+        let grid_top = terminal_y_offset;
+        let grid_bottom = terminal_y_offset + available_height;
+        let grid_left = 0.0_f32;
+        let grid_right = self.width as f32;
+        
+        // Transform pane coordinates to screen space (same as border rendering)
+        let mut screen_x = grid_x_offset + pane_x;
+        let mut screen_y = terminal_y_offset + grid_y_offset + pane_y;
+        let mut width = pane_width;
+        let mut height = pane_height;
+        
+        // Use a larger epsilon to account for cell-alignment gaps in split panes
+        // With cell-aligned splits, gaps can be up to one cell height
+        let epsilon = self.cell_height.max(self.cell_width);
+        
+        // Left edge at screen boundary - extend to screen left edge
+        if pane_x < epsilon {
+            width += screen_x - grid_left;
+            screen_x = grid_left;
+        }
+        
+        // Right edge at screen boundary - extend to screen right edge
+        if (pane_x + pane_width) >= available_width - epsilon {
+            width = grid_right - screen_x;
+        }
+        
+        // Top edge at grid boundary - extend to grid top (respects tab bar/statusline at top)
+        if pane_y < epsilon {
+            height += screen_y - grid_top;
+            screen_y = grid_top;
+        }
+        
+        // Bottom edge at grid boundary - extend to grid bottom (respects tab bar/statusline at bottom)
+        if (pane_y + pane_height) >= available_height - epsilon {
+            height = grid_bottom - screen_y;
+        }
+        
+        (screen_x, screen_y, width, height)
+    }
+
     /// Converts a pixel position to a terminal cell position.
     /// Returns None if the position is outside the terminal area (e.g., in the tab bar or statusline).
     pub fn pixel_to_cell(&self, x: f64, y: f64) -> Option<(usize, usize)> {
@@ -4055,8 +4199,10 @@ impl Renderer {
         self.statusline_gpu_cells.clear();
         
         // Calculate target columns based on window width
+        // Use ceil() to ensure we cover the entire window edge-to-edge
+        // (the rightmost cell may extend slightly past the window, which is fine)
         let target_cols = if self.cell_width > 0.0 {
-            (target_width / self.cell_width).floor() as usize
+            (target_width / self.cell_width).ceil() as usize
         } else {
             self.statusline_max_cols
         };
@@ -4224,9 +4370,16 @@ impl Renderer {
                 }
             }
             StatuslineContent::Sections(sections) => {
-                for section in sections.iter() {
+                for (section_idx, section) in sections.iter().enumerate() {
                     let section_bg = Self::pack_statusline_color(section.bg);
                     
+                    // Get next section's background for powerline arrow transition
+                    let next_section_bg = if section_idx + 1 < sections.len() {
+                        Self::pack_statusline_color(sections[section_idx + 1].bg)
+                    } else {
+                        default_bg
+                    };
+                    
                     for component in section.components.iter() {
                         let component_fg = Self::pack_statusline_color(component.fg);
                         let style = if component.bold { FontStyle::Bold } else { FontStyle::Regular };
@@ -4358,10 +4511,10 @@ impl Renderer {
                         let arrow_char = '\u{E0B0}';
                         let (sprite_idx, _) = self.get_or_create_sprite_for(arrow_char, FontStyle::Regular, SpriteTarget::Statusline);
                         
-                        // Arrow foreground is section background, arrow background is next section bg or default
+                        // Arrow foreground is current section's bg, arrow background is next section's bg
                         self.statusline_gpu_cells.push(GPUCell {
                             fg: section_bg,      // Arrow takes section bg color as its foreground
-                            bg: default_bg, // Will be overwritten if there's a next section
+                            bg: next_section_bg, // Background is the next section's background
                             decoration_fg: 0,
                             sprite_idx,
                             attrs: 0,
@@ -4371,6 +4524,19 @@ impl Renderer {
             }
         }
         
+        // Fill remaining width with default background cells
+        // This ensures the statusline covers the entire window width
+        let default_bg_packed = Self::pack_statusline_color(StatuslineColor::Default);
+        while self.statusline_gpu_cells.len() < target_cols && self.statusline_gpu_cells.len() < self.statusline_max_cols {
+            self.statusline_gpu_cells.push(GPUCell {
+                fg: 0,
+                bg: default_bg_packed,
+                decoration_fg: 0,
+                sprite_idx: 0,
+                attrs: 0,
+            });
+        }
+        
         self.statusline_gpu_cells.len()
     }
 
@@ -6705,6 +6871,7 @@ impl Renderer {
                 Direction::Right => 3,
             };
 
+            // Glow coordinates are already in screen space (transformed by calculate_edge_glow_bounds)
             glow_instances[i] = GlowInstance {
                 direction,
                 progress: glow.progress(),
@@ -6753,6 +6920,10 @@ impl Renderer {
         // Sync palette from first terminal
         if let Some((terminal, _, _)) = panes.first() {
             self.palette = terminal.palette.clone();
+            log::debug!("render_panes: synced palette from first terminal, default_bg={:?}, default_fg={:?}", 
+                self.palette.default_bg, self.palette.default_fg);
+        } else {
+            log::debug!("render_panes: no panes, using existing palette");
         }
 
         let output = self.surface.get_current_texture()?;
@@ -6794,19 +6965,20 @@ impl Renderer {
                 TabBarPosition::Hidden => unreachable!(),
             };
 
-            let tab_bar_bg = {
+            // Use same color as statusline: 0x1a1a1a (26, 26, 26) in sRGB
-                let [r, g, b] = self.palette.default_bg;
+            // Linear RGB value: ~0.00972
-                let factor = 0.85_f32;
+            let tab_bar_bg = [
-                [
+                Self::srgb_to_linear(26.0 / 255.0),
-                    Self::srgb_to_linear((r as f32 / 255.0) * factor),
+                Self::srgb_to_linear(26.0 / 255.0),
-                    Self::srgb_to_linear((g as f32 / 255.0) * factor),
+                Self::srgb_to_linear(26.0 / 255.0),
-                    Self::srgb_to_linear((b as f32 / 255.0) * factor),
                 1.0,
-                ]
+            ];
-            };
 
             // Draw tab bar background
+            log::debug!("render_panes: drawing tab bar at y={}, height={}, num_tabs={}, quads_before={}", 
+                tab_bar_y, tab_bar_height, num_tabs, self.quads.len());
             self.render_rect(0.0, tab_bar_y, width, tab_bar_height, tab_bar_bg);
+            log::debug!("render_panes: after tab bar rect, quads_count={}", self.quads.len());
 
             // Render each tab
             let mut tab_x = 4.0_f32;
@@ -6820,15 +6992,25 @@ impl Renderer {
                 let tab_width = title_width.max(min_tab_width);
 
                 let tab_bg = if is_active {
+                    // Active tab: brightest - significantly brighter than tab bar
                     let [r, g, b] = self.palette.default_bg;
+                    let boost = 50.0_f32; // More visible for active tab
                     [
-                        Self::srgb_to_linear(r as f32 / 255.0),
+                        Self::srgb_to_linear((r as f32 + boost).min(255.0) / 255.0),
-                        Self::srgb_to_linear(g as f32 / 255.0),
+                        Self::srgb_to_linear((g as f32 + boost).min(255.0) / 255.0),
-                        Self::srgb_to_linear(b as f32 / 255.0),
+                        Self::srgb_to_linear((b as f32 + boost).min(255.0) / 255.0),
                         1.0,
                     ]
                 } else {
-                    tab_bar_bg
+                    // Inactive tab: slightly brighter than tab bar background
+                    let [r, g, b] = self.palette.default_bg;
+                    let boost = 30.0_f32;
+                    [
+                        Self::srgb_to_linear((r as f32 + boost).min(255.0) / 255.0),
+                        Self::srgb_to_linear((g as f32 + boost).min(255.0) / 255.0),
+                        Self::srgb_to_linear((b as f32 + boost).min(255.0) / 255.0),
+                        1.0,
+                    ]
                 };
 
                 let tab_fg = {
@@ -6934,6 +7116,15 @@ impl Renderer {
             // Tolerance for detecting adjacent panes (should be touching or very close)
             let adjacency_tolerance = 1.0;
             
+            // Calculate grid boundaries for extending borders to screen edges
+            // Same technique as edge glow and dim overlay
+            let (available_width, available_height) = self.available_grid_space();
+            let grid_top = terminal_y_offset;
+            let grid_bottom = terminal_y_offset + available_height;
+            let grid_left = 0.0_f32;
+            let grid_right = width;
+            let epsilon = self.cell_height.max(self.cell_width);
+
             // Check each pair of panes to find adjacent ones
             for i in 0..panes.len() {
                 for j in (i + 1)..panes.len() {
@@ -6962,9 +7153,19 @@ impl Renderer {
                     // Pane A is to the left of pane B (A's right edge touches B's left edge)
                     if (a_right - b_x).abs() < adjacency_tolerance {
                         // Check if they overlap vertically
-                        let top = a_y.max(b_y);
+                        let mut top = a_y.max(b_y);
-                        let bottom = a_bottom.min(b_bottom);
+                        let mut bottom = a_bottom.min(b_bottom);
                         if bottom > top {
+                            // Extend to grid edges if both panes reach the edge
+                            // Top edge: extend if both panes are at grid top
+                            if info_a.y < epsilon && info_b.y < epsilon {
+                                top = grid_top;
+                            }
+                            // Bottom edge: extend if both panes reach grid bottom
+                            if (info_a.y + info_a.height) >= available_height - epsilon 
+                               && (info_b.y + info_b.height) >= available_height - epsilon {
+                                bottom = grid_bottom;
+                            }
                             // Draw vertical border centered on their shared edge
                             let border_x = a_right - border_thickness / 2.0;
                             self.render_overlay_rect(border_x, top, border_thickness, bottom - top, border_color);
@@ -6972,9 +7173,17 @@ impl Renderer {
                     }
                     // Pane B is to the left of pane A
                     if (b_right - a_x).abs() < adjacency_tolerance {
-                        let top = a_y.max(b_y);
+                        let mut top = a_y.max(b_y);
-                        let bottom = a_bottom.min(b_bottom);
+                        let mut bottom = a_bottom.min(b_bottom);
                         if bottom > top {
+                            // Extend to grid edges if both panes reach the edge
+                            if info_a.y < epsilon && info_b.y < epsilon {
+                                top = grid_top;
+                            }
+                            if (info_a.y + info_a.height) >= available_height - epsilon 
+                               && (info_b.y + info_b.height) >= available_height - epsilon {
+                                bottom = grid_bottom;
+                            }
                             let border_x = b_right - border_thickness / 2.0;
                             self.render_overlay_rect(border_x, top, border_thickness, bottom - top, border_color);
                         }
@@ -6984,9 +7193,19 @@ impl Renderer {
                     // Pane A is above pane B (A's bottom edge touches B's top edge)
                     if (a_bottom - b_y).abs() < adjacency_tolerance {
                         // Check if they overlap horizontally
-                        let left = a_x.max(b_x);
+                        let mut left = a_x.max(b_x);
-                        let right = a_right.min(b_right);
+                        let mut right = a_right.min(b_right);
                         if right > left {
+                            // Extend to screen edges if both panes reach the edge
+                            // Left edge: extend if both panes are at grid left
+                            if info_a.x < epsilon && info_b.x < epsilon {
+                                left = grid_left;
+                            }
+                            // Right edge: extend if both panes reach grid right
+                            if (info_a.x + info_a.width) >= available_width - epsilon 
+                               && (info_b.x + info_b.width) >= available_width - epsilon {
+                                right = grid_right;
+                            }
                             // Draw horizontal border centered on their shared edge
                             let border_y = a_bottom - border_thickness / 2.0;
                             self.render_overlay_rect(left, border_y, right - left, border_thickness, border_color);
@@ -6994,9 +7213,17 @@ impl Renderer {
                     }
                     // Pane B is above pane A
                     if (b_bottom - a_y).abs() < adjacency_tolerance {
-                        let left = a_x.max(b_x);
+                        let mut left = a_x.max(b_x);
-                        let right = a_right.min(b_right);
+                        let mut right = a_right.min(b_right);
                         if right > left {
+                            // Extend to screen edges if both panes reach the edge
+                            if info_a.x < epsilon && info_b.x < epsilon {
+                                left = grid_left;
+                            }
+                            if (info_a.x + info_a.width) >= available_width - epsilon 
+                               && (info_b.x + info_b.width) >= available_width - epsilon {
+                                right = grid_right;
+                            }
                             let border_y = b_bottom - border_thickness / 2.0;
                             self.render_overlay_rect(left, border_y, right - left, border_thickness, border_color);
                         }
@@ -7027,6 +7254,9 @@ impl Renderer {
             let pane_width = info.width;
             let pane_height = info.height;
             
+            log::debug!("render_panes: pane {} at ({}, {}), size {}x{}, bottom_edge={}", 
+                info.pane_id, pane_x, pane_y, pane_width, pane_height, pane_y + pane_height);
+
             // Update GPU cells for this terminal (populates self.gpu_cells)
             self.update_gpu_cells(terminal);
             
@@ -7056,8 +7286,9 @@ impl Renderer {
                 screen_height: self.height as f32,
                 x_offset: pane_x,
                 y_offset: pane_y,
-                cursor_col: if terminal.cursor_visible { terminal.cursor_col as i32 } else { -1 },
+                // Hide cursor when scrolled into scrollback buffer or when cursor is explicitly hidden
-                cursor_row: if terminal.cursor_visible { terminal.cursor_row as i32 } else { -1 },
+                cursor_col: if terminal.cursor_visible && terminal.scroll_offset == 0 { terminal.cursor_col as i32 } else { -1 },
+                cursor_row: if terminal.cursor_visible && terminal.scroll_offset == 0 { terminal.cursor_row as i32 } else { -1 },
                 cursor_style: match terminal.cursor_shape {
                     CursorShape::BlinkingBlock | CursorShape::SteadyBlock => 0,
                     CursorShape::BlinkingUnderline | CursorShape::SteadyUnderline => 1,
@@ -7098,11 +7329,14 @@ impl Renderer {
                 );
             }
             
-            // Build dim overlay if needed
+            // Build dim overlay if needed - use calculate_dim_overlay_bounds to extend
+            // edge panes to fill the terminal grid area (matching edge glow behavior)
             let dim_overlay = if info.dim_factor < 1.0 {
                 let overlay_alpha = 1.0 - info.dim_factor;
                 let overlay_color = [0.0, 0.0, 0.0, overlay_alpha];
-                Some((pane_x, pane_y, pane_width, pane_height, overlay_color))
+                // Pass raw grid-relative coordinates, the helper transforms to screen space
+                let (ox, oy, ow, oh) = self.calculate_dim_overlay_bounds(info.x, info.y, info.width, info.height);
+                Some((ox, oy, ow, oh, overlay_color))
             } else {
                 None
             };
@@ -7447,12 +7681,9 @@ impl Renderer {
             render_pass.set_vertex_buffer(0, self.vertex_buffer.slice(..));
             render_pass.set_index_buffer(self.index_buffer.slice(..), wgpu::IndexFormat::Uint32);
             
-            // Draw bg + glyph indices (tab bar text uses legacy vertex rendering)
-            render_pass.draw_indexed(0..total_index_count as u32, 0, 0..1);
-
             // ═══════════════════════════════════════════════════════════════════
             // INSTANCED QUAD RENDERING (tab bar backgrounds, borders, etc.)
-            // Rendered before cell content so backgrounds appear behind cells
+            // Rendered FIRST so backgrounds appear behind text
             // ═══════════════════════════════════════════════════════════════════
             if !self.quads.is_empty() {
                 render_pass.set_pipeline(&self.quad_pipeline);
@@ -7460,6 +7691,14 @@ impl Renderer {
                 render_pass.draw(0..4, 0..self.quads.len() as u32);
             }
             
+            // Draw bg + glyph indices (tab bar text uses legacy vertex rendering)
+            // Rendered AFTER quads so text appears on top of backgrounds
+            render_pass.set_pipeline(&self.glyph_pipeline);
+            render_pass.set_bind_group(0, &self.glyph_bind_group, &[]);
+            render_pass.set_vertex_buffer(0, self.vertex_buffer.slice(..));
+            render_pass.set_index_buffer(self.index_buffer.slice(..), wgpu::IndexFormat::Uint32);
+            render_pass.draw_indexed(0..total_index_count as u32, 0, 0..1);
+
             // ═══════════════════════════════════════════════════════════════════
             // INSTANCED CELL RENDERING (Like Kitty's per-window VAO approach)
             // Each pane has its own bind group with its own buffers.
@@ -7518,10 +7757,10 @@ impl Renderer {
             // Rendered last so overlays appear on top of everything
             // ═══════════════════════════════════════════════════════════════════
             if !self.overlay_quads.is_empty() {
-                // Upload overlay quads to the buffer (reusing the same buffer)
+                // Upload overlay quads to the SEPARATE overlay buffer to avoid overwriting tab bar quads
-                self.queue.write_buffer(&self.quad_buffer, 0, bytemuck::cast_slice(&self.overlay_quads));
+                self.queue.write_buffer(&self.overlay_quad_buffer, 0, bytemuck::cast_slice(&self.overlay_quads));
                 render_pass.set_pipeline(&self.quad_pipeline);
-                render_pass.set_bind_group(0, &self.quad_bind_group, &[]);
+                render_pass.set_bind_group(0, &self.overlay_quad_bind_group, &[]);
                 render_pass.draw(0..4, 0..self.overlay_quads.len() as u32);
             }
         }

src/statusline_shader.wgsl

@@ -144,6 +144,9 @@ struct VertexOutput {
 // HELPER FUNCTIONS
 // ═══════════════════════════════════════════════════════════════════════════════
 
+// Statusline default background color (0x1a1a1a in linear RGB)
+const STATUSLINE_DEFAULT_BG: vec3<f32> = vec3<f32>(0.00972, 0.00972, 0.00972);
+
 // Resolve a packed color to RGBA
 fn resolve_color(packed: u32, is_foreground: bool) -> vec4<f32> {
     let color_type = packed & 0xFFu;
@@ -152,7 +155,8 @@ fn resolve_color(packed: u32, is_foreground: bool) -> vec4<f32> {
         if is_foreground {
             return color_table.colors[256];
         } else {
-            return color_table.colors[257];
+            // Statusline uses a solid default background, not the terminal's transparent one
+            return vec4<f32>(STATUSLINE_DEFAULT_BG, 1.0);
         }
     } else if color_type == COLOR_TYPE_INDEXED {
         let index = (packed >> 8u) & 0xFFu;
@@ -207,13 +211,9 @@ fn vs_statusline_bg(
     let ndc_pos = pixel_to_ndc(positions[vertex_index], screen_size);
     
     let fg = resolve_color(cell.fg, true);
-    var bg = resolve_color(cell.bg, false);
+    let bg = resolve_color(cell.bg, false);
     
-    // For default background, use transparent
+    // Statusline always has solid background (no transparency for default bg)
-    let bg_type = cell.bg & 0xFFu;
-    if bg_type == COLOR_TYPE_DEFAULT {
-        bg.a = 0.0;
-    }
     
     var out: VertexOutput;
     out.clip_position = vec4<f32>(ndc_pos, 0.0, 1.0);

src/terminal.rs

@@ -517,6 +517,7 @@ impl Terminal {
 
     /// Creates a new terminal with the given dimensions and scrollback limit.
     pub fn new(cols: usize, rows: usize, scrollback_limit: usize) -> Self {
+        log::info!("Terminal::new: cols={}, rows={}, scroll_bottom={}", cols, rows, rows.saturating_sub(1));
         let grid = vec![vec![Cell::default(); cols]; rows];
         let line_map: Vec<usize> = (0..rows).collect();
         
@@ -704,6 +705,8 @@ impl Terminal {
             return;
         }
         
+        log::info!("Terminal::resize: {}x{} -> {}x{}", self.cols, self.rows, cols, rows);
+
         let old_cols = self.cols;
         let old_rows = self.rows;
 
@@ -1260,10 +1263,12 @@ impl Handler for Terminal {
                 }
                 // Line feed, Vertical tab, Form feed
                 '\x0A' | '\x0B' | '\x0C' => {
+                    let old_row = self.cursor_row;
                     self.cursor_row += 1;
                     if self.cursor_row > self.scroll_bottom {
                         self.scroll_up(1);
                         self.cursor_row = self.scroll_bottom;
+                        log::trace!("LF: scrolled at row {}, now at scroll_bottom {}", old_row, self.cursor_row);
                     }
                     // Update cache after line change
                     cached_row = self.cursor_row;
@@ -1609,17 +1614,23 @@ impl Handler for Terminal {
             // Cursor Up
             'A' => {
                 let n = params.get(0, 1).max(1) as usize;
+                let old_row = self.cursor_row;
                 self.cursor_row = self.cursor_row.saturating_sub(n);
+                log::trace!("CSI A: cursor up {} from row {} to {}", n, old_row, self.cursor_row);
             }
             // Cursor Down
             'B' => {
                 let n = params.get(0, 1).max(1) as usize;
+                let old_row = self.cursor_row;
                 self.cursor_row = (self.cursor_row + n).min(self.rows - 1);
+                log::trace!("CSI B: cursor down {} from row {} to {}", n, old_row, self.cursor_row);
             }
             // Cursor Forward
             'C' => {
                 let n = params.get(0, 1).max(1) as usize;
+                let old_col = self.cursor_col;
                 self.cursor_col = (self.cursor_col + n).min(self.cols - 1);
+                log::trace!("CSI C: cursor forward {} from col {} to {}", n, old_col, self.cursor_col);
             }
             // Cursor Back
             'D' => {
@@ -1641,7 +1652,9 @@ impl Handler for Terminal {
             // Cursor Horizontal Absolute (CHA)
             'G' => {
                 let col = params.get(0, 1).max(1) as usize;
+                let old_col = self.cursor_col;
                 self.cursor_col = (col - 1).min(self.cols - 1);
+                log::trace!("CSI G: cursor to col {} (was {})", self.cursor_col, old_col);
             }
             // Cursor Position
             'H' | 'f' => {