QDockWidgetGroupWindow was documented by a few lines of code comments, omitting the most critical part of its design: It must not become able to acquire focus (i.e. be dragged or dropped) while having only one QDockWidget child. => replace legacy code comments by structured internal documentation. Pick-to: 6.5 Change-Id: I410ebf2e4c20c7479038417a4d8448dce8ab995f Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io> (cherry picked from commit 3591ea900b720ff48aace14cd81c8ec9d22b5c73) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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