[Gimp-developer] Windows -> Image display actions potential improvement

[David Gowers]

The attached patch allows you to open several images, assign keyboard
shortcuts to them, and these shortcuts will persist, so that if you
assigned '1','2','3' to the first, second, and third image, you could
continue to switch between the first, second, and third opened image
with 1, 2, and 3.
Because of the caveat below, this is currently no better than
associating the actions directly with display IDs, rather than
associating the actions with indices into the list of displays.

Caveats :
 *Currently implemented in a hackish way
 *Does not cope properly with closing images -- it breaks all the
actions following and including the closed image.. So say you closed
image #3, and you had already opened a 4th and 5th, the actions for 3,
4, and 5 would break.
I'm unclear as to the exact cause of this. Does anyone here know?
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