Fix random crash on linux

mkdocs-website/docs/en/changelog.md

@@ -73,6 +73,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix handling of multiple return values from bound methods by [@fbbdev](https://github.com/fbbdev) in [#3431](https://github.com/wailsapp/wails/pull/3431)
 - Fix doctor detection of npm that is not installed with system package manager by [@pekim](https://github.com/pekim) in [#3458](https://github.com/wailsapp/wails/pull/3458)
 - Fix missing MicrosoftEdgeWebview2Setup.exe. Thanks to [@robin-samuel](https://github.com/robin-samuel).
+- Fix random crash on linux due to window ID handling by @leaanthony. Based on PR [#3466](https://github.com/wailsapp/wails/pull/3622) by [@5aaee9](https://github.com/5aaee9).
 
 ### Changed
 

v3/pkg/application/linux_cgo.go

@@ -56,6 +56,16 @@ typedef struct WindowEvent {
     uint event;
 } WindowEvent;
 
+static void save_window_id(void *object, uint value)
+{
+    g_object_set_data((GObject *)object, "windowid", GUINT_TO_POINTER((guint)value));
+}
+
+static guint get_window_id(void *object)
+{
+    return GPOINTER_TO_UINT(g_object_get_data((GObject *)object, "windowid"));
+}
+
 // exported below
 void activateLinux(gpointer data);
 extern void emit(WindowEvent* data);
@@ -991,11 +1001,10 @@ func windowNewWebview(parentId uint, gpuPolicy WebviewGpuPolicy) pointer {
 	manager := C.webkit_user_content_manager_new()
 	C.webkit_user_content_manager_register_script_message_handler(manager, c.String("external"))
 	webView := C.webkit_web_view_new_with_user_content_manager(manager)
-	winID := unsafe.Pointer(uintptr(C.uint(parentId)))
 
 	// attach window id to both the webview and contentmanager
-	C.g_object_set_data((*C.GObject)(unsafe.Pointer(webView)), c.String("windowid"), C.gpointer(winID))
-	C.g_object_set_data((*C.GObject)(unsafe.Pointer(manager)), c.String("windowid"), C.gpointer(winID))
+	C.save_window_id(unsafe.Pointer(webView), C.uint(parentId))
+	C.save_window_id(unsafe.Pointer(manager), C.uint(parentId))
 
 	registerURIScheme.Do(func() {
 		context := C.webkit_web_view_get_context(C.webkit_web_view(webView))
@@ -1486,7 +1495,7 @@ func getKeyboardState(event *C.GdkEventKey) (string, bool) {
 //export onProcessRequest
 func onProcessRequest(request *C.WebKitURISchemeRequest, data C.uintptr_t) {
 	webView := C.webkit_uri_scheme_request_get_web_view(request)
-	windowId := uint(uintptr(C.g_object_get_data((*C.GObject)(unsafe.Pointer(webView)), C.CString("windowid"))))
+	windowId := uint(C.get_window_id(unsafe.Pointer(webView)))
 	webviewRequests <- &webViewAssetRequest{
 		Request:    webview.NewRequest(unsafe.Pointer(request)),
 		windowId:   windowId,
@@ -1499,15 +1508,15 @@ func sendMessageToBackend(contentManager *C.WebKitUserContentManager, result *C.
 	data unsafe.Pointer) {
 
 	// Get the windowID from the contentManager
-	windowID := uint(uintptr(C.g_object_get_data((*C.GObject)(unsafe.Pointer(contentManager)), C.CString("windowid"))))
+	thisWindowID := uint(C.get_window_id(unsafe.Pointer(contentManager)))
 
 	var msg string
 	value := C.webkit_javascript_result_get_js_value(result)
 	message := C.jsc_value_to_string(value)
 	msg = C.GoString(message)
 	defer C.g_free(C.gpointer(message))
 	windowMessageBuffer <- &windowMessage{
-		windowId: windowID,
+		windowId: thisWindowID,
 		message:  msg,
 	}
 }