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which also requires no documentation changes - the behaviour is now
what you would predict from existing docs (as opposed to a crash!)
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I'm still not quite sure what exactly was going wrong in the bug, but
I suspect the problem might have actually been due to the deletion of
all images while in the midst of creating an image. The restriction
is pretty light when it comes to existing code, since it previously
caused a core dump due to an image typePtr field being set to random
garbage, an indication of over-eager use of free()...
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* tests/image.test: Added tests for [image inuse] command.
* generic/tkImage.c (Tk_ImageObjCmd): Added [image inuse] command,
which provides a means for programmers to determine if a given
image is in use by any widgets. [RFE: 3327].
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