https://bugs.kde.org/show_bug.cgi?id=425318
Ahab Greybeard changed:
What|Removed |Added
CC||ahab.greybe...@hotmail.co.u
||k
Ever confirmed|0 |1
Status|REPORTED|CONFIRMED
--- Comment #1 from Ahab Greybeard ---
I can confirm this for the Aug13 4.3.1 alpha (git adcd40a) appimage and it
happens for the 4.2.0 appimage onwards.
The situation and the various effects that can be observed are many, varied and
complicated.
It has to be seen to be fully appreciated.
For a layer set to Copy blending mode, if you paint on it with any brush
engine, there are artifacts around the brush stroke.
If you then toggle the Background layer, it won't come back to visible.
If you then turn off the paint layer, you get a white rectangle that is larger
than the bounding box of the painted stroke.
If you then set the layer blending mode to normal, you get the painted stroke
on the white rectangle.
Then toggling the Background layer brings it back to visible.
Then setting the layer blending mode to Copy gives a different set of
behaviours as you toggle the visibility of the two layers in different ways.
For a brush preset painting in Copy mode, there are artifacts around the stroke
for the Pixel engine brushes and other brush engines but not the Colour Smudge,
unless it is used close to the stroke from another brush engine, in which case
there are hidden artifacts that are revealed by painting with the Colour Smudge
brush preset.
For a Filter layer, there are no artifacts when switching from Normal layer
blending to Copy Blending.
Panting on a filter layer with a brush preset set to Copy mode does give
artifacts around the stroke.
If the filter layer is then set to Copy blending mode, these artifacts become
larger.
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