There were some keybindings that was relying on the previously broken state of "confirm on release" for keyboard shortcuts.
These shortcuts should now be fixed for the node editor.
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Please revert rB30bf48c9caee: Fix T63921: Unable to use confirm on release for keyboard shortcuts, and then it can be committed again with this change after 2.80 is out. I do not want to risk breaking keymaps to support a feature that didn't work in 2.79 either.