fix: linux, custom client, incoming only, resizable (#8005)

Signed-off-by: fufesou <shuanglongchen@yeah.net>

flutter/lib/common.dart

@@ -55,6 +55,12 @@ var isMobile = isAndroid || isIOS;
 var version = '';
 int androidVersion = 0;
 
+// Only used on Linux.
+// `windowManager.setResizable(false)` will reset the window size to the default size on Linux.
+// https://stackoverflow.com/questions/8193613/gtk-window-resize-disable-without-going-back-to-default
+// So we need to use this flag to enable/disable resizable.
+bool _linuxWindowResizable = true;
+
 /// only available for Windows target
 int windowsBuildNumber = 0;
 DesktopType? desktopType;
@@ -1572,7 +1578,7 @@ Future<void> saveWindowPosition(WindowType type, {int? windowId}) async {
       // `await windowManager.isMaximized()` will always return true
       // if is not resizable. The reason is unknown.
       //
-      // `windowManager.setResizable(!bind.isIncomingOnly());` in main.dart
+      // `setResizable(!bind.isIncomingOnly());` in main.dart
       isMaximized =
           bind.isIncomingOnly() ? false : await windowManager.isMaximized();
       position = await windowManager.getPosition();
@@ -3234,7 +3240,9 @@ Widget buildVirtualWindowFrame(BuildContext context, Widget child) {
   return Obx(
     () => Container(
       decoration: BoxDecoration(
-        color: isMainDesktopWindow ? Colors.transparent : Theme.of(context).colorScheme.background,
+        color: isMainDesktopWindow
+            ? Colors.transparent
+            : Theme.of(context).colorScheme.background,
         border: Border.all(
           color: Theme.of(context).dividerColor,
           width: stateGlobal.windowBorderWidth.value,
@@ -3258,4 +3266,18 @@ Widget buildVirtualWindowFrame(BuildContext context, Widget child) {
   );
 }
 
-get windowEdgeSize => isLinux && bind.isIncomingOnly() ? 0.0 : kWindowEdgeSize;
+get windowEdgeSize => isLinux && _linuxWindowResizable ? 0.0 : kWindowEdgeSize;
+
+// `windowManager.setResizable(false)` will reset the window size to the default size on Linux and then set unresizable.
+// See _linuxWindowResizable for more details.
+// So we use `setResizable()` instead of `windowManager.setResizable()`.
+//
+// We can only call `windowManager.setResizable(false)` if we need the default size on Linux.
+setResizable(bool resizable) {
+  if (isLinux) {
+    _linuxWindowResizable = resizable;
+    stateGlobal.refreshResizeEdgeSize();
+  } else {
+    windowManager.setResizable(resizable);
+  }
+}

flutter/lib/consts.dart

@@ -154,6 +154,7 @@ const kDefaultScrollDuration = Duration(milliseconds: 50);
 const kDefaultMouseWheelThrottleDuration = Duration(milliseconds: 50);
 const kFullScreenEdgeSize = 0.0;
 const kMaximizeEdgeSize = 0.0;
+// Do not use kWindowEdgeSize directly. Use `windowEdgeSize` in `common.dart` instead.
 final kWindowEdgeSize = isWindows ? 1.0 : 5.0;
 final kWindowBorderWidth = isLinux ? 1.0 : 0.0;
 const kDesktopMenuPadding = EdgeInsets.only(left: 12.0, right: 3.0);

flutter/lib/desktop/pages/desktop_tab_page.dart

@@ -57,10 +57,10 @@ class _DesktopTabPageState extends State<DesktopTabPage> {
       tabController.onSelected = (key) {
         if (key == kTabLabelHomePage) {
           windowManager.setSize(getIncomingOnlyHomeSize());
-          windowManager.setResizable(false);
+          setResizable(false);
         } else {
           windowManager.setSize(getIncomingOnlySettingsSize());
-          windowManager.setResizable(true);
+          setResizable(true);
         }
       };
     }

flutter/lib/main.dart

@@ -144,12 +144,8 @@ void runMainApp(bool startService) async {
     }
     windowManager.setOpacity(1);
     windowManager.setTitle(getWindowName());
-    // `windowManager.setResizable(false)` will reset the window size to the default size on Linux.
-    // https://stackoverflow.com/questions/8193613/gtk-window-resize-disable-without-going-back-to-default
-    if (!isLinux) {
-      windowManager.setResizable(!bind.isIncomingOnly());
-    }
-    // For Linux, we set the edge size to 0 to disable resize. See `get windowEdgeSize` in common.dart.
+    // Do not use `windowManager.setResizable()` here.
+    setResizable(!bind.isIncomingOnly());
   });
 }
 
@@ -243,7 +239,7 @@ void runConnectionManagerScreen() async {
   } else {
     await showCmWindow(isStartup: true);
   }
-  windowManager.setResizable(false);
+  setResizable(false);
   // Start the uni links handler and redirect links to Native, not for Flutter.
   listenUniLinks(handleByFlutter: false);
 }

flutter/lib/models/state_model.dart

@@ -56,8 +56,7 @@ class StateGlobal {
     if (!_fullscreen.isTrue) {
       if (isMaximized.value != v) {
         isMaximized.value = v;
-        _resizeEdgeSize.value =
-            isMaximized.isTrue ? kMaximizeEdgeSize : windowEdgeSize;
+        refreshResizeEdgeSize();
       }
       if (!isMacOS) {
         _windowBorderWidth.value = v ? 0 : kWindowBorderWidth;
@@ -71,11 +70,7 @@ class StateGlobal {
     if (_fullscreen.value != v) {
       _fullscreen.value = v;
       _showTabBar.value = !_fullscreen.value;
-      _resizeEdgeSize.value = fullscreen.isTrue
-          ? kFullScreenEdgeSize
-          : isMaximized.isTrue
-              ? kMaximizeEdgeSize
-              : windowEdgeSize;
+      refreshResizeEdgeSize();
       print(
           "fullscreen: $fullscreen, resizeEdgeSize: ${_resizeEdgeSize.value}");
       _windowBorderWidth.value = fullscreen.isTrue ? 0 : kWindowBorderWidth;
@@ -96,6 +91,12 @@ class StateGlobal {
     }
   }
 
+  refreshResizeEdgeSize() => _resizeEdgeSize.value = fullscreen.isTrue
+      ? kFullScreenEdgeSize
+      : isMaximized.isTrue
+          ? kMaximizeEdgeSize
+          : windowEdgeSize;
+
   String getInputSource({bool force = false}) {
     if (force || _inputSource.isEmpty) {
       _inputSource = bind.mainGetInputSource();