fix: shift background in accordance with content

Modules/Lock/LockSurface.qml

@@ -149,9 +149,34 @@ WlSessionLockSurface {
 	Image {
 		id: background
 
+		anchors.bottomMargin: -8 - lockContent.positions[lockContent.positionIndex].y
 		anchors.fill: parent
+		anchors.leftMargin: -8 + lockContent.positions[lockContent.positionIndex].x
+		anchors.rightMargin: -8 - lockContent.positions[lockContent.positionIndex].x
+		anchors.topMargin: -8 + lockContent.positions[lockContent.positionIndex].y
 		fillMode: Image.PreserveAspectCrop
 		source: WallpaperPath.lockscreenBg
+
+		Behavior on anchors.bottomMargin {
+			Anim {
+				duration: 5000
+			}
+		}
+		Behavior on anchors.leftMargin {
+			Anim {
+				duration: 5000
+			}
+		}
+		Behavior on anchors.rightMargin {
+			Anim {
+				duration: 5000
+			}
+		}
+		Behavior on anchors.topMargin {
+			Anim {
+				duration: 5000
+			}
+		}
 	}
 
 	Item {