The deficit here is not the action, but rather that the action is not
documented in any way except in the source.
>From the source there are two ways to open the editor, either by setting
the "Automatically launch when a new mail is edited" option and then
pressing any key in the Evolution editor,
** Changed in: evolution (Ubuntu)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1860374
Title:
External Editor plugin does not open external edit
