Please describe the problem:
With every drawing tools, if I move fast the mouse or tablet stylus in the canvas window, the line become rectangular and not smooth. This should be a gimp bug, because it is not reproducible neither in inkscape, neither in painter.

Steps to reproduce:
1. Choose a drawing tool as brush
2. Move fast the mouse or tablet stylus in the canvas window with left button pushed on the mouse or pushing the stylus on the tablet 
3. The result will be inacceptable.


Actual results:
The drawn line will be not smooth.

Expected results:
The drawn line will be not smooth.

Does this happen every time?
Yes. I think it is a mouse tracking problem. Maybe after a lot of repetitions in a very short time, the intermediate steps are ignored by the program.

Other information:
I can send you a picture about the problem, if you can't reproduce the problem.