message_edit: Fix `tab + enter` broken for saving. #1

Job	Run time
Ubuntu 22.04 (Python 3.10, backend + frontend)	30m 54s
Debian 12 (Python 3.11, backend + documentation)	20m 46s
Ubuntu 24.04 (Python 3.12, backend)	21m 21s
	1h 13m 1s

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