Ability to keep pumping messages while being debugged, may be a solution for #21431

core/os/os.h

@@ -518,6 +518,7 @@ public:
 	bool is_restart_on_exit_set() const;
 	List<String> get_restart_on_exit_arguments() const;
 
+	virtual void process_and_drop_events() { }
 	OS();
 	virtual ~OS();
 };

core/script_debugger_remote.cpp

@@ -311,6 +311,7 @@ void ScriptDebuggerRemote::debug(ScriptLanguage *p_script, bool p_can_continue)
 
 		} else {
 			OS::get_singleton()->delay_usec(10000);
+			OS::get_singleton()->process_and_drop_events();
 		}
 	}
 

platform/windows/os_windows.cpp

@@ -298,6 +298,17 @@ void OS_Windows::_drag_event(float p_x, float p_y, int idx) {
 
 LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
 
+	if (drop_events) {
+
+		if (user_proc) {
+
+			return CallWindowProcW(user_proc, hWnd, uMsg, wParam, lParam);
+		} else {
+			return DefWindowProcW(hWnd, uMsg, wParam, lParam);
+		}
+	};
+
+
 	switch (uMsg) // Check For Windows Messages
 	{
 		case WM_SETFOCUS: {
@@ -2230,7 +2241,9 @@ void OS_Windows::process_events() {
 
 	MSG msg;
 
-	joypad->process_joypads();
+	if (!drop_events) {
+		joypad->process_joypads();
+	}
 
 	while (PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE)) {
 
@@ -2238,7 +2251,9 @@ void OS_Windows::process_events() {
 		DispatchMessageW(&msg);
 	}
 
-	process_key_events();
+	if (!drop_events) {
+		process_key_events();
+	}
 }
 
 void OS_Windows::set_cursor_shape(CursorShape p_shape) {
@@ -2987,6 +3002,13 @@ bool OS_Windows::is_disable_crash_handler() const {
 	return crash_handler.is_disabled();
 }
 
+void OS_Windows::process_and_drop_events() {
+
+	drop_events=true;
+	process_events();
+	drop_events=false;
+}
+
 Error OS_Windows::move_to_trash(const String &p_path) {
 	SHFILEOPSTRUCTW sf;
 	WCHAR *from = new WCHAR[p_path.length() + 2];
@@ -3015,6 +3037,7 @@ Error OS_Windows::move_to_trash(const String &p_path) {
 
 OS_Windows::OS_Windows(HINSTANCE _hInstance) {
 
+	drop_events = false;
 	key_event_pos = 0;
 	layered_window = false;
 	hBitmap = NULL;

platform/windows/os_windows.h

@@ -127,6 +127,7 @@ class OS_Windows : public OS {
 	bool window_has_focus;
 	uint32_t last_button_state;
 	bool use_raw_input;
+	bool drop_events;
 
 	HCURSOR cursors[CURSOR_MAX] = { NULL };
 	CursorShape cursor_shape;
@@ -330,6 +331,8 @@ public:
 
 	virtual Error move_to_trash(const String &p_path);
 
+	virtual void process_and_drop_events();
+
 	OS_Windows(HINSTANCE _hInstance);
 	~OS_Windows();
 };