Problem with disappearing pieces

[uckelman]

Thus spake “morvael”:

I had this problem a long ago, and even reported it here I think, but it was
not solved.

What happens is when a Command generated using

Code:
map.placeOrMerge(gp, p)

is undone pieces sometimes disappear.

They are not destroyed, rather the map is no longer aware it has to display s
uch piece.

I think I have nailed when it happens, because other combinations work, unfor
tunately I can’t show you exact piece of code where it happens (it would requ
ire a lot of reading of code that I haven’t written myself, so I’m not eager
to do it, you may find the problem faster).

The problem happens only when gp is placed in p, where a single GamePiece is
present. If there would be a Stack of 2 or more pieces or At-Start Stack of e
ven a single GamePiece (I don’t know how they differ) the piece would not dis
appear. I guess the undo code somehow is unable to bring back that single pie
ce.

So to sum it up:

GamePiece moved to Stack location → on undo ok
GamePiece moved to At-Start Stack location → on undo ok
GamePiece moved to GamePiece location → on undo the GamePiece that was alrea
dy there will disappear.

If you wish I can make in-game movie of that situation, if it will be of some
help.

This is a problem we’d like to resolve. Does it still happen with 3.1.12?
If so, could you create a simple test case for us and file a bug report?

–
J.

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