https://bugs.kde.org/show_bug.cgi?id=421744

--- Comment #5 from Dmitry Kazakov <dimul...@gmail.com> ---
Hi, Lynx3D!

The idea of merging channel flags, opacity and blending mode is the following:

1) If all three coincide, then we merge the two layers using Normal blending
mode and set channel flags, opacity and blending mode of the original layers.

2) If at least one of the properties differ, then we create a clean new layer
with default properties and just merge in both layers using their settings.

The idea of the approach is that we preserve the visual look of the image as
much as possible. If you have ideas how to improve that, please ping me on IRC

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