Update of bug #20068 (project mypaint):
Status: None => Confirmed
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Follow-up Comment #3:
Can also reproduce with pen button2 in the subwindow, then (quickly!) pen
button2 on the main canvas: not switching buttons makes reproducing it
easier.
The "pointer grab failed: <enum GDK_GRAB_ALREADY_GRABBED" message occurs on
every pointer down while trapped in the DragMode. Pressing Escape cancels any
established grabs, and resets the mode stack to the regular drawing mode (it's
an escape hatch for bugs like these!)
I think the grab that's causing the problem is the implicit
"button-press-event" → "button-release-event" grab on the color widget. I
notice in the two-window case both of us have been seeing changes of device
when switching window: devices interlock with implicit grabs in fairly comples
ways, as you can imagine. Sigh.
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