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Added a new driver and created a connection. Right clicked and selected Execute Command. Went to the SQL Command area and typed SELET by mistake. Tried to backspace to delete the T and nothing happened. Tried to do this several times but the backspace key does not work in that editor. Created a new Java class and verified that the backspace does work there.
After playing around with the format options, it started to work.
I recall seeing similar behavior once, but I don't think it is caused by the SQL editor itself. I have never seen this before and there were no changes in the SQL editor in 6.0. Reassigning to editor for evaluation.
Just experienced it in the Java editor. The movement (arrows, PgDn/Up, Home, etc.) keys don't work. Backspace doesn't either. Delete does, but shows a wait cursor, as if it was an asynchronous action.
Probably a dupe of recently fixed bug.
Should be fixed now. The code for loading keybindings was cleaned up when fixing issue #109038. Please try again in a dev build and reopen if it happens again.