[plasmashell] [Bug 446581] plasmashell and Firefox hang in QXcbClipboard::waitForClipboardEvent() when Firefox attempts to update the clipboard and show a notification at the same time

[nyanpasu64]

https://bugs.kde.org/show_bug.cgi?id=446581

--- Comment #9 from nyanpasu64 <nyanpas...@tuta.io> ---
Problem: QMimeData is non-copyable, and obtained from KSystemClipboard (either
QtClipboard or WaylandClipboard), and the main thread might erase it while the
worker thread is in the middle of calling QMimeData::text() to request data
from another process. Do we need to move all KSystemClipboard access to another
thread, and only send contents to the main thread? Or is qGuiApp->clipboard()
only safe to call (or call methods on QClipboard) from the main thread? In
which case I see no solution without abandoning KSystemClipboard/QClipboard
altogether.

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