[SDL] Nervous about keyboard state usage

[Erik]

I get nervous when I see event handling code that that checks the state 
of keys. It is such a common error to check the current key state (or 
mouse position, ...) and get a result that is different from the state 
when the handled event actually happened. (Not even KDE gets it right, 
[http://bugs.kde.org/show_bug.cgi?id=151355].)

Therefore I wonder whether the following error might happen in an SDL 
application:
1. 'X' key is pressed.
2. Control is pressed.
3. Application calls SDL_PollEvent, which calls SDL_PumpEvents. It sets 
the state of the 'X' key to DOWN and the state of Control key to DOWN. 
Then it returns the 'X' key press event to Application.
4. Application handles the 'X' key press event and the handler checks 
the state of the Control key. SDL says it is DOWN, because that is the 
current state. But it was not down when the handled event occurred, so 
the result will be erroneous.