Info Catalog
nano: Using the Mouse
nano: Editor Basics
4.8 Limitations
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Justifications (‘^J’) are not yet covered by the general undo system.
So after a justification that is not immediately undone, earlier edits
cannot be undone any more. The workaround is, of course, to exit
without saving.
The recording and playback of keyboard macros works correctly only on
a terminal emulator, not on a Linux console (VT), because the latter
does not by default distinguish modified from unmodified arrow keys.