fix: 修复任务栏位置切换时的显示异常

通过改进位置切换逻辑，实现平滑的过渡动画：
1. 在切换位置时，先保存新位置并临时恢复到旧位置
2. 在旧位置播放隐藏动画
3. 切换到新位置后，从隐藏状态播放显示动画
4. 使用状态标志精确控制动画流程，避免闪烁和显示异常

这样可以确保任务栏在位置切换时不会出现空白区域、内容溢出或突然跳变的问题。

Log: 修复任务栏位置切换时的显示异常
PMS: BUG-346777

Author: Ivy233

panels/dock/package/main.qml

@@ -165,6 +165,7 @@ Window {
         id: dockAnimation
         property bool useTransformBasedAnimation: Qt.platform.pluginName === "xcb"
         property bool isShowing: false
+        property bool isPositionChanging: false
         property var target: useTransformBasedAnimation ? dockTransform : dock
         property string animProperty: {
             if (useTransformBasedAnimation) return dock.useColumnLayout ? "x" : "y";
@@ -212,6 +213,17 @@ Window {
             } else {
                 dock.visible = ((dock.useColumnLayout ? dock.width : dock.height) !== 1);
             }
+
+            // If this was a hide animation during position change, handle the position change now
+            if (isPositionChanging && !isShowing) {
+                isPositionChanging = false;
+                positionChangeConnections.handlePositionChangeAfterHide();
+            } else {
+                // If this was a show animation and dock should be hidden, trigger auto-hide
+                if (isShowing && Panel.hideState === Dock.Hide) {
+                    hideTimer.running = true;
+                }
+            }
         }
     }
 
@@ -221,34 +233,20 @@ Window {
         required property int value
         text: name
 
-        property var positionChangeCallback: function() {
-            // Disconnect any existing callback first
-            dockAnimation.onStopped.disconnect(positionChangeCallback);
-            // Stop any running animations first --fix bug with do not show dock
-            dockAnimation.stop();
-            // Reset transform before starting new animation--fix bug with change position,will have a blank area
-            dockTransform.x = 0;
-            dockTransform.y = 0;
+        onTriggered: {
+            if (Applet[prop] === value) {
+                // Manually restore checked state since Qt already toggled it
+                checked = true;
+                return;
+            }
+            Applet[prop] = value
+        }
 
-            Applet[prop] = value;
+        Component.onCompleted: {
             checked = Qt.binding(function() {
                 return Applet[prop] === value;
             });
-            dockAnimation.startAnimation(true);
-        }
-        onTriggered: {
-            if (prop === "position") {
-                // Connect the callback and start the hide animation
-                dockAnimation.onStopped.connect(positionChangeCallback);
-                dockAnimation.startAnimation(false);
-            } else {
-                Applet[prop] = value
-                checked = Qt.binding(function() {
-                    return Applet[prop] === value
-                })
-            }
         }
-        checked: Applet[prop] === value
     }
     component MutuallyExclusiveMenu: LP.Menu {
         id: menu
@@ -665,9 +663,78 @@ Window {
     }
 
     Connections {
+        id: positionChangeConnections
+        property int previousPosition: Panel.position
+        property int savedNewPosition: -1
+        property bool isRestoringPosition: false
+
         function onPositionChanged() {
+            // Ignore position changes triggered by our own restore operation
+            if (isRestoringPosition) {
+                return;
+            }
+
+            // Save the new position
+            savedNewPosition = Panel.position;
+
+            // Set flag to ignore the next position change
+            isRestoringPosition = true;
+
+            // Temporarily restore to previous position for hide animation
+            Applet.position = previousPosition;
+
+            // Clear the flag after restore
+            isRestoringPosition = false;
+
+            // Stop any running animations first
+            dockAnimation.stop();
+            hideShowAnimation.stop();
+
+            // Mark that we're changing position
+            dockAnimation.isPositionChanging = true;
+
+            // Check if dock is currently hidden
+            if (Panel.hideState === Dock.Hide && !dock.visible) {
+                // Directly handle position change without animation
+                dockAnimation.isPositionChanging = false;
+                handlePositionChangeAfterHide();
+            } else {
+                // Start hide animation at old position
+                dockAnimation.startAnimation(false);
+            }
+        }
+
+        function handlePositionChangeAfterHide() {
+            if (savedNewPosition === -1) return;
+
+            // Apply position change
+            previousPosition = savedNewPosition;
+            Applet.position = savedNewPosition;
+            savedNewPosition = -1;
+
             changeDragAreaAnchor()
             Panel.requestClosePopup()
+
+            // Set transform to hidden position before showing
+            if (dockAnimation.useTransformBasedAnimation) {
+                var hideOffset = (Applet.position === Dock.Left || Applet.position === Dock.Top) ? -Panel.dockSize : Panel.dockSize;
+                if (dock.useColumnLayout) {
+                    dockTransform.x = hideOffset;
+                    dockTransform.y = 0;
+                } else {
+                    dockTransform.x = 0;
+                    dockTransform.y = hideOffset;
+                }
+            } else {
+                dockTransform.x = 0;
+                dockTransform.y = 0;
+            }
+
+            dockAnimation.startAnimation(true);
+        }
+
+        Component.onCompleted: {
+            previousPosition = Panel.position
         }
         function onDockSizeChanged() {
             dock.dockSize = Panel.dockSize