Review Request 127014: Avoid ghost entry in xembed sni proxy.

[Xuetian Weng]

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https://git.reviewboard.kde.org/r/127014/
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Review request for Plasma and David Edmundson.


Bugs: 358719
    https://bugs.kde.org/show_bug.cgi?id=358719


Repository: plasma-workspace


Description
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It is possible that window is destroyed before we start to monitor its event.

I notice following errors when 358719 is triggered.
QXcbConnection: XCB error: 3 (BadWindow), sequence: 517, resource id: 113246233, major code: 2 (ChangeWindowAttributes), minor code: 0

Try to check if any error happens before we add our event mask to the window attributes.


Diffs
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  xembed-sni-proxy/fdoselectionmanager.h 911df6c 
  xembed-sni-proxy/fdoselectionmanager.cpp f236e9c 

Diff: https://git.reviewboard.kde.org/r/127014/diff/


Testing
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358719 is now fixed.


Thanks,

Xuetian Weng

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