GNOME Bugzilla – Bug 732064
tablet pc: draw a line "under" the tool window using a pen - tool switches to a mouse tool color
Last modified: 2016-12-08 09:55:57 UTC
On a tablet pc, using a pen - draw a thick black line, using a mouse draw a thick red line, take a pen and start draw a line and move it to the edge of any tool window - when a pen "touches" the edge of a window, or "goes under" the window, tool switches to the mouse red color in a square shape (not even in a shape of your mouse tool), and all the time you are "under" the window it will switch back and forth from red square to black square and you will have a line distorted by these red-black squares.
This might be a problem in GTK+.
Some more info on this: If the same color is selected with both mouse and pen, this doesn't happen. If a different tool is selected by mouse, the pen will freeze/stop accepting input after it goes over the edge. This is the same with all tools.
Well, if the same color is selected, you won't notice that the tools switch, but it likely still happens. Try with a different brush tip. Still, most likely a problem in GTK+ itself, where GIMP does get all the tablet device data delivered from.
Ah yes, if it's the same color the tool will also switch and will sometimes paint with the different brush tip, but no squares will be created.
I guess this is the known "tablet device switches between core pointer and stylus" problem. There's a bug for this already, didn't find it yet.
Thanks for taking the time to report this. This particular bug has already been reported into our bug tracking system, but please feel free to report any further bugs you find. *** This bug has been marked as a duplicate of bug 771444 ***