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Commit e5b34d5cd (Suppress autosuggesting during backspacing like browsers do,
2012-02-06) disabled autosuggestion when backspacing. Autosuggestions are
re-enabled whenever we insert anything in the command line. Undo uses a
different code path to insert into the command line, which does not re-enable
autosuggestion.
Fix that.
Also re-enable autosuggestion when undo erases from the command line.
This seems like the simplest approach. It's not clear if there's a better
behavior; browsers don't agree on one in any case.