> The function gimp-drawable-type-with-alpha wasn't
> completely guarded. Calling it with a non-existent
> drawable would cause a crash.
We force a crash in that place (by using a g_assert) since
something has gone wrong. With your patch we would return a 
perfectly valid image_type and gimp would continue, but
a few function calls later it would certainly crash.

I have inserted a few more 
g_return_if_fail (GIMP_IS_DRAWABLE (drawable)) and friends which
should help to locate problems early.

Salut, Sven

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