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Strange effect with form DockedFormEditor

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prof7bit:
Got it! Can now reliably demonstrate the bug:
https://gitlab.com/freepascal.org/lazarus/lazarus/-/issues/39409

Please try and see if you can reproduce.

prof7bit:
Could already somebody reproduce the issue with my example project?

Meanwhile I have found one more that is easier to reproduce, it seems somhow related although this time it also involves DPI scaling, I added it to the bug report:

https://gitlab.com/freepascal.org/lazarus/lazarus/-/issues/39409#note_701183272

The visible symptoms are the same: some controls are growing absurdly large, larger than the form itself, like the first example it only seems to happen when minwidth/minsize is set, but this time no unusual things happen to clientwidth/clientheight and this time it also happens immediately when shown in dockedformeditor, I have not yet found a way to avoid this corruption other than manually editing the DesignTimePPI with a text editor before attempting to open it in DockedFormeditor, otherwise corruption is guaranteed.

Please tell me if anybody can at least reproduce my problems with these examples.

prof7bit:
It seems this issue only appears on Qt5
I just tested on GTK2 and nothing unusual happens

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