Added logic to not resize Qt main window when applying video settings if screen is in fullsize or maximize modes.

src/drivers/Qt/ConsoleVideoConf.cpp

@@ -947,7 +947,10 @@ void ConsoleVideoConfDialog_t::applyChanges( void )
 			consoleWindow->viewport_SDL->reset();
 		}
 
-		consoleWindow->resize( s );
+		if ( !consoleWindow->isFullScreen() && !consoleWindow->isMaximized() )
+		{
+			consoleWindow->resize( s );
+		}
 
 		updateReadouts();
 	}