Make editor support `--fullscreen` command-line argument

main/main.cpp

@@ -1012,13 +1012,11 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 				goto error;
 			}
 		} else if (I->get() == "-f" || I->get() == "--fullscreen") { // force fullscreen
-
 			init_fullscreen = true;
+			window_mode = DisplayServer::WINDOW_MODE_FULLSCREEN;
 		} else if (I->get() == "-m" || I->get() == "--maximized") { // force maximized window
-
 			init_maximized = true;
 			window_mode = DisplayServer::WINDOW_MODE_MAXIMIZED;
-
 		} else if (I->get() == "-w" || I->get() == "--windowed") { // force windowed window
 
 			init_windowed = true;
@@ -1603,7 +1601,7 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 	if (editor) {
 		packed_data->set_disabled(true);
 		main_args.push_back("--editor");
-		if (!init_windowed) {
+		if (!init_windowed && !init_fullscreen) {
 			init_maximized = true;
 			window_mode = DisplayServer::WINDOW_MODE_MAXIMIZED;
 		}