Details
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Bug
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Resolution: Fixed
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P1: Critical
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5.12.3, 5.13.0
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cfd2cc91fdae40d8e1eddfc2f9ff2585a0b708e4 (qt/qtbase/5.12)
Description
The QLabels are not painting correctly inside a QMdiArea that is in tabbed mode.
This started happening after we upgraded from Qt 5.9.8 to Qt 5.12.3.
It looks like the background is not painting for the QLabel when it is inside of a tabbed QMdiArea. When the QMdiArea is tiled, the background is painting correctly. Issue is not seen on Windows.
Please find the attached sample and snapshots for the issue.