Testing for regressions in Krita with Qt 5.15.0
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Description

Krita 5.0.0 Prealpha (Qt 5.15.0)
ZIP: https://yadi.sk/d/8KPAKEJEYpt53w

Krita 4.3.1 Prealpha (Qt 5.15.0)

Putting the qmdiarea in windowed mode hangs krita, no matter whether canvas acceleration is enabled or not (Halla)
Painting seems quite a bit slower (Halla
There's something really weird going on when opening a dialog, like settings, with the titlebars of the dialog and the mainwindow flickering as if they cannot decide who gets focus (Halla)

dkazakov updated the task description. (Show Details)

Right-clicking on a spinbox slider (to type the desired value) doesn't work

Reports from KA:

Right-click on a layer in the layers docker does not bring up the menu.
creating a new file seems to take more time (but maybe it’s flickering that make me feel this)
some flickering on the interface as mention on the first post
the right click popup wasn’t appearing at first but after closing and reopening my document, it was working
the advanced color selector was not updating after picking a color on the canvas with “ctrl” key

It looks like Qt 5.14 has a regression in tablet support on Linux when HiDPI mode is enabled: https://bugs.kde.org/show_bug.cgi?id=427039