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There are several ways to encounter this problem -- Do something which will invoke code completion on a non-trivial XML file -- for example, on a line containing an XML node and is prefixed by two or more tab indents, put the caret right before the "<", and enter a Shift-Tab (to left shift the line by one tab). Code completion will pop up and its presence will block entering a second Shift-Tab to left shift the line again. This is what I was trying to do when I encountered this. It is really annoying, as now you have to hit escape and do it again (for every tab you want to remove in this manner.) OTOH, (most) normal typing will be accepted. There may be other keybindings besides Shift-Tab that are blocked however.
Reproducible in the last build. Same thing for Tab (see 112343).
*** Issue 112343 has been marked as a duplicate of this issue. ***
Seems like Tab, Shift+Tab all are getting blocked because of this. *** This issue has been marked as a duplicate of 105539 ***