Clipboard empties when resizing in GNOME Wayland

This issue looks like a regression of https://bugreports.qt.io/browse/QTBUG-93474.

Same as QTBUG-93474, this bug only occurs when clipboard is filled by other applications, and switching to other apps and back could restore the clipboard. However, simply right clicking seems not triggering this - instead, resizing window (and maybe some other approaches, but I could reproduce with resizing reliably) empties clipboard this time.

In https://codereview.qt-project.org/c/qt/qtwayland/+/360355, if `dataDevice->invalidateSelectionOffer();` is commented out in `QWaylandDisplay::handleWaylandSync()`, the clipboard would not be emptied.