My gimpsketchbook app is offering an alternative (extended) interface
for gimp via a plugin that acts as a proxy between the gimpsketchbook
I would like to be able to add buttons for selecting the current
active tool (for example, select the pencil or the paintbrush) or to
execute undo/redo. Unfortunately, there are no functions in pdb for
any of these. Any idea how I can implement these?
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