[issue6878] changed return type from tkinter.Canvas.coords

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

Committed in r86697 (3.2) and r86698 (3.1).

@Éric: I tried to minimize whitespace changes in the commit, but if you see indentation that can be improved, let me know and I'll fix it separately.

@SilentGhost: Yes, the problem is real.  For example, turtle module had to be fixed to work around the API change.  I now reverted that.  Note that 2to3 (I believe) fixes direct invocations of map, but cannot look inside the functions.

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