Originally Posted By: tanstaafl.
Originally Posted By: shonky
Too late now but you could/should have pressed Ctrl-Z to undo the n replacing all the text.
I did that within one or two seconds after my text went away, but Gmail had already autosaved the new draft.

Ctrl+Z should work, unless you navigated elsewhere in the meantime. Did you map something else to Ctrl+Z too?
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Matt