Memory game disappear animation leaves ghosts

[cdlm]

When you find a pair, cards are animated scaling smaller and getting transparent.
They're supposed to become fully invisible but they don't, and the ghost cards left behind are still interactive.

In the screenshot, the game is fully solved. The small square in the rightmost column is an example of a card that didn't fully disappear. There are other smaller ones in the first row. The code is supposed to scale the cards down to 1% of their full size which is much smaller than that.

The two big ghost cards in the middle are what you get by clicking those tiny squares.

To me this suggests either that the animation stops before it's really finished, or that when it stops it doesn't get a chance to update the card elements to their final state.

[tinchodias]

This is probably the same cause as this bug: pharo-graphics/Bloc#194

[cdlm]

Indeed, that's quite possible. It's like the penultimate frame is drawn, the animation finishes before the next one, and there should be (but actually isn't) an additional frame drawn to show the final state of the animation even if it's drawn a bit late.

[LNUitTutor]

The method MGCardElement>>onDisappear uses two animations ( vanish and minimize) of equal duration: both of them is set to 0.35 seconds. Setting of slightly different durations, for instance 0.35 and 0.4 or vice versa, can fix the bug.