Bug 309619

With Krita 2.5.2 on Ubuntu, to achieve smooth size transitions with a mouse, I often set Size Dynamic to Speed, switch to "Draw Dynamically" then increase the drag value to about 50.

Doing the same on Krita 2.5.2 then 2.5.9 Windows XP results in major size jittering, preventing smooth transitions. When drawing, you can literally see the cursor blinking in size. This happens with both the Pixel Brush and the Curve brush. See the linked image to see the difference. I haven't tested on other versions of Windows though.

This is problematic because this is one of my most used and recommended tricks for mouse users.

Reproducible: Always

Steps to Reproduce:
1. Make a pixel brush. Set Size dynamics to Speed.
2. Choose "draw dynamically" mode, set drag to 50.
3. Draw at moderate speeds
Actual Results:  
Instead of smooth line variations, the brush will quickly shift sizes along the line. 

Expected Results:  
The "draw dynamically" mode is supposed to smooth size transitions, which it does quite well on the Linux version.

This is not a problem with my mouse, I tried it with another mouse and mousepad.