bug#68570: 29.1; recompile might not re-use project-compile's buffer

[Juri Linkov]

> We could make a new option in compile.el which would determine whether to
> do this in general: when non-nil, 'compilation-start' would save the
> current dynamic value of 'compilation-buffer-name-function', and
> 'recompile' would call it again.

A new option would be nice, but it's so broken that I don't know
if it helps.  For example, 'M-x compile RET' in a compilation buffer
doesn't prefill the minibuffer with the current compilation command,
but uses the default command that makes no sense.