https://bugs.kde.org/show_bug.cgi?id=461313

            Bug ID: 461313
           Summary: Isotropic spacing option is not working in default
                    predefined brushtips
    Classification: Applications
           Product: krita
           Version: 5.1.1
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: * Unknown
          Assignee: krita-bugs-n...@kde.org
          Reporter: mirandagrap...@gmail.com
  Target Milestone: ---

Created attachment 153396
  --> https://bugs.kde.org/attachment.cgi?id=153396&action=edit
Isotropic visual guide 01

STEPS TO REPRODUCE
1. Start Krita
2. Select the Basic 2 Opacity 
3. Open the brush editor
4. Disable the opacitiy and flow and rotation options. 
5. Disable Auto spacing. Put normal spacing to 1.0, Ratio 0.25 and Angle 90ยบ
6. Activate "Isotropic" in Spacing Option, Disable enable pen settings option
and see how it changes.

EXPECTED RESULT
Isotropic spacing must to keep the blank space (arround the brush tip) that we
achieve with Ratio change. And if isotropic is disabled the spacing between
dabs is 1.0 so they are touching them in the edges.(It deppends on Fade
parameter.)

OBSERVED RESULT
Now go to predefined brush and select "chisel Eroded" brushtip. (works with
others too)
Disable Auto spacing. Put normal spacing to 1.0
Change size to 40px to see it in the same scale as Auto brush.
Activate "Isotropic" in Spacing Option if it is not active, Disable enable pen
settings option and see how it changes.
Isotropic spacing must to keep the blank space (arround the brush tip) But now
we need to reduce the spacing to see how the brushtips are touching them to
arround 0.5

Try the same with and RGBA brushtip and reacts as Auto brushtips. As i talked
with Dmitry i thought, that Krita was understanding white pixels as part of the
brushtip, But he reviewed the code in master iirw so i am reporting it. (My
tests are in 5.1.1)
I put in normal severity because i don't know if i decide that. 
I hope this helps, because for flat brushes it would speed up them. Thanks for
reading it.

SOFTWARE/OS VERSIONS
Windows: 10
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Qt

  Version (compiled): 5.12.12
  Version (loaded): 5.12.12

OS Information

  Build ABI: x86_64-little_endian-llp64
  Build CPU: x86_64
  CPU: x86_64
  Kernel Type: winnt
  Kernel Version: 10.0.19043
  Pretty Productname: Windows 10 (10.0)
  Product Type: windows
  Product Version: 10

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