Mouse button is released

Can you add such condition? I know we can emulate them with additional variables but it would be good if we could check for it with just one action.

On additional thoughts, similar event for keyboard is needed.

It’s the kind of event that will not work on Linux GD. Because, I would use an SFML event and SFML event don’t work when SFML is in WxWidget (same cause as the bug of text entry).