bug#63648: 29.0.90; project.el: with switch-use-entire-map, switch-project errors on non-project commands

[Juri Linkov]

>>> So a similar function could remember 'project-current-directory-override'
>>> for the next command.
>>
>> But we were talking about "regular" commands, right? Those don't know
>> anything about project-current-directory-override.
>
> Any command indeed.  They should use the temporarily set default-directory.

Actually, instead of 'project-current-directory-override' I meant
'default-directory'.  But probably this is impossible to do
because of these restrictions:

1. the current buffer should remain the same for the next command;
2. the buffer-local value of 'default-directory' should remain the same;
3. the next command should have a new value of 'default-directory'.

I see no way to satisfy all these requirements.