The issue was that we were still working around a Xorg bug that has been solved since a very long time:
https://bugs.freedesktop.org/show_bug.cgi?id=22515
The second issue was that the global "confirm on release for mouse clicks" was used for keyboard shortcuts as well.
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Updated the patch to fix node shortcuts that relied on this being broken.
As mentioned in D5139, this will now be for 2.81