Bug 368720

When using the Shift shortcut to change brush size in krita 3.0.1, the dimension of the brush appears to jump a fixed ammount regardless of canvas size or pen movement speed.

Video demonstration of the problem in krita 3.0.1, and how it used to be back in 3.0(portable): 

https://www.youtube.com/watch?v=A5bxkCjqa9k&index=1&list=PLPbpshXgNLr-PRRnk9onOeb6NbEyJVy3N

This is a very annoying issue for me, since my workflow consist mostly on working at 1:1 zoom level and resizing the layers/image as i need more definition:

Demonstration of use before and after the changes:

3.0:
https://www.youtube.com/watch?v=JUCX1ZAAzIE&index=2&list=PLPbpshXgNLr-PRRnk9onOeb6NbEyJVy3N

3.0.1:
https://www.youtube.com/watch?v=KNL7qh0ELS0&index=3&list=PLPbpshXgNLr-PRRnk9onOeb6NbEyJVy3N

Before the change, moving the pen while holding Shift had pretty much the same effect as clicking the size bar and dragging left or right, and it was easy to find exactly the size needed because the brush size and outline changed smoothly and in unison.

After the change, it seems to add/remove a constant amount per tablet cm, it makes it almost impossible to do precision work, and the awkwardness of having to double check wether or not the brush is of the size needed each time makes entering "the zone" impossible...


Reproducible: Always

Steps to Reproduce:
1.Open document, preferrably small one under 1000px
2.Pick brush preset with default size under 100px
3.Resize by holding Shift and moving the pen left or right.

Actual Results:  
Brush size jumps from 0.10px to over 50px in less than a cm of tablet space...

Expected Results:  
Brush size changes according to pen speed/canvas size/zoom level etc, or atleast increases smoothly/exponentially to accomodate for both small and large sizes.

Using windows 7, Krita 3.0.1 install version.