[krita] [Bug 463186] New: Transparent pixels change the bound of layer thumbnails

[Manga Tengu]

https://bugs.kde.org/show_bug.cgi?id=463186

            Bug ID: 463186
           Summary: Transparent pixels change the bound of layer
                    thumbnails
    Classification: Applications
           Product: krita
           Version: 5.1.4
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Layer Stack
          Assignee: krita-bugs-null at kde.org
          Reporter: mangatengu at gmail.com
  Target Milestone: ---

Created attachment 154664
  --> https://bugs.kde.org/attachment.cgi?id=154664&action=edit
Observed result

SUMMARY
Layer thumbnails allow to quickly identify layers.
Wen drawing on a small portion of the canvas, the thumbnails are zoomed on them
so they can still display something meaningful to the artist.
The problem is brush strokes, even when totally empty, change the bound of the
image on the layer:
When you look at the thumbnail, it looks empty or very zoomed out and unusable.

STEPS TO REPRODUCE
1. Make a big canvas and add an empty layer on top (checkerboards)
2. Make a small mark in a corner of the canvas. Note the layer thumbnail is
nice and zoomed correctly (first attachement)
3. Turn eraser mode on a classic pixel brush. Make an erasing mark on the
opposite side of the canvas. The thumbnail now zoomed out to take the whole
canvas. Your real content (the first little mark on the first corner, is
undistinguishable)

Done on a macbook pro 16" with M1 processor with macOS 12.6.1 (21G217)

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