Hi, I have stumble upon a clipboard issue.
I am working on a project wher we use Qt and CEF (Chromium Embedded). The CEF event loop is integrated in Qt by calling CefDoMessageLoopWork() periodically from Qt main event loop. The issue arises when we copy/paste content from CEF into Qt (widget or qt quick item): all the UI freezes for several seconds and at the end nothing is pasted. I have been able to locate the issue in QXcbClipboard::waitForClipboardEvent() and QXcbEventQueue::waitForNewEvents() where Qt waits to receive the clipboard content without running the event loop. Also it seems that CEF needs to have CefDoMessageLoopWork() called to process the clipboard event on its side. In the end, we end up with a deadlock where Qt is waiting for CEF to send the clipboard content, but CEF is waiting for Qt to run CefDoMessageLoopWork(). I was able to make it work by using QClipboard from another thread and it works. But I am not sure it is safe to interact with the clipboard from a non UI thread and anyway this solution is not applicable all the clipboard interactions already handled by Qt. Has anyone ever encountered this kind of issue? Is it intended that Qt stops processing event while waiting for the clipboard? Regards, Benjamin
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