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24.0.50; heuristic mask is turned on on gif images willy-nilly


Some gif images' background will be made transparent.
Please try this:

emacs -Q -bg black -fg white scholartest2009.gif

Where the gif file is:


It is due to `create-animated-image' that puts the heuristic mask
property to gif images unconditionally.  image-mode uses it.
Is it intentional?  I hope the `:mask heuristic' element is removed
from `create-animated-image'.

Emacs-w3m uses `create-animated-image' if it is available, instead
of `create-image'.  It causes some gif images to be transparent.