Reliably enable window defocus on Linux #499
Merged
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The FocusIn/FocusOut X11 events are more reflective of active foreground window that Enter/Leave, which only relates to mouse movement. In particular, FocusOut fires when Alt-Tabbing away so the alt key is correctly released.
Also re-enable IDE defocus processing on Linux so the Alt key no longer keeps the menus selected when Alt-Tabbing. This effectively reverts QB64Team/qb64#1 which as far as I can tell was solely because one person didn't like the defocus behaviour.