Hi,
I'm using darktable [1], an open-source photography workflow
application and raw developer, basically a free Adobe Lr alternative.
Recently I noticed a bug: Darktable allows to select areas
(aka. shapes) on a photograph, and apply operations only to those
areas instead of to the whole image. Usually, one can drag these
shapes around with the mouse, holding down button 1. The bug
manifests when pressing button 1 on a shape: It jumps away (southeast)
from the pointer, maybe even outside of the window. It is not
possible to drag te shape to the top left area of the image. The
effect is larger to the lower right of the screen.
I've filed a bug report [2] in darktable's tracker, and also
*temporarily* provide screencasts [3].
Pascal suggested that it's an issue with the window manager, which
would be FVWM on my machine. He cannot reproduce on Gnome. I've
tested the following:
* The bug disappears when using Openbox instead of FVWM, and also
when not using any window manager at all (only X then).
* I have (among others) this binding in my FVWM config
mouse 1 A 4 moveOrRaise
Disabling this makes the bug disappear, reenabling it produces the
bug again. This is demonstrated in the 3rd video [4].
* I have not seen this with any other application, so mabe it's
linked to a rather exotic/brand new feature not employed often by
X clients.
Can anyone reproduce this?
Thanks!
Stefan
____________________
[1] https://www.darktable.org/
[2] https://redmine.darktable.org/issues/12387
[3] https://depot.s5k6.net/B53pnjQAHxnTgvTw/
[4] https://depot.s5k6.net/B53pnjQAHxnTgvTw/03-change_mouse_binding_hi.mp4
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