improper KEYDOWN events

[jzfalero]

When a keyboard key is pressed 1 time and then held down, it is expected that only 1 single KEYDOWN event will be queued. However, if we switch between full-screen and windowed modes in response to the KEYDOWN event and keep the key pressed, something unexpected happens. Since pygame.display.set_mode() destroys the window and then creates a new one, this new window seems to sense the key press and then improperly places another KEYDOWN event on the queue. As a result of this, the window goes into full-screen mode, in response to the first KEYDOWN event, but then returns to windowed mode, in response to the second KEYDOWN event, which should not exist.

Environment: Linux(Debian), X11, Python 3.9.2, Pygame 2.5.2, SDL 2.28.2