There is a possibility that the same card gets added twice to
m_focused_cards when first mousedown_event fires and then
doubleclick_event, without the cards redrawing first. This would cause
mouseup_event to try to pop too many cards from the stack, causing an
assertion to fail.
When the system is laggy there is also a high possibility that
mousedown_event would fire twice without redrawing the cards first,
causing another assertion to fail. Addditional mousedown_events will
just be ignored now.
Added a solitaire game. Currently there are graphics missing on some
of the cards, but the game is fully functional.
Press F12 to show the game-over animation manually.
