Extend default value of tramp-shell-prompt-pattern?

[Kai Großjohann]

In some German newsgroups, it has been suggested to extend the default
value of tramp-shell-prompt-pattern to allow an escape sequence at the
end.  And escape sequence appears to look like this usually:

    ESC [ <number> m

Maybe it would be useful to allow more general things, so the
following regexp (in Lisp string notation) might match what we need:

    "\e\\[[0-9;]*."

What do people think?  I know too little about terminal escape
sequences to be able to say.

I think the cleaner solution would be to tell people to frob their
shell init files such that they omit the escape sequences if $TERM is
dumb.  But that solution also requires work from the users, whereas
extending the regexp is something that can be done in the Lisp code
of Tramp.

A potential disadvantage of the regexp solution is that it might make
Tramp more fragile.

Opinions?
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