fix: normalize zoom slider to linear scale

Modules/Settings/Common/WallpaperCropper.qml

@@ -13,13 +13,23 @@ import qs.Services
 Item {
 	id: wrapper
 
+	readonly property var currentScreen: screens.length > selectedScreenIndex ? screens[selectedScreenIndex] : null
+	readonly property real maxZoom: 5.0
+
 	property int buttonRowHeight: Tokens.padding.large * 3
 	property bool changesMade: false
-	readonly property var currentScreen: screens.length > selectedScreenIndex ? screens[selectedScreenIndex] : null
 	property var screens: []
 	property int selectedScreenIndex: 0
 	property bool shouldBeActive: true
 
+	function zoomFromSlider(t: real): real {
+		return 1 / (1 - t * (1 - 1 / maxZoom));
+	}
+
+	function sliderFromZoom(zoom: real): real {
+		return (1 - 1 / zoom) / (1 - 1 / maxZoom);
+	}
+
 	function applyCrop(): void {
 		if (!cropRectLoader.item || !currentScreen)
 			return;
@@ -144,14 +154,12 @@ Item {
 			Layout.leftMargin: Tokens.padding.small
 			Layout.preferredHeight: Tokens.padding.medium * 3
 			Layout.rightMargin: Tokens.padding.small
-			from: 1.0
 			implicitHeight: Tokens.padding.small * 3
 			insetIcon: "crop"
-			to: 5.0
-			value: cropRectLoader.item ? cropRectLoader.item.zoom : 1.0
+			value: cropRectLoader.item ? wrapper.sliderFromZoom(cropRectLoader.item.zoom) : 0
 
 			onInteraction: value => {
-				wrapper.zoomClipRect(1 + (value * 4));
+				wrapper.zoomClipRect(wrapper.zoomFromSlider(value));
 			}
 
 			onPosChanged: wrapper.changesMade = true