bug#8366: wish: include vc-annotate-goto-line

[martin rudalics]

> Annotate buffer may display a different version that the one of the
> checked out file.  E.g. because you have local uncommitted changes, or
> because you asked for the annotations of an older revision.  So line
> numbers may not fully match.  In general, there's no much we can do
> about it, but we should probably try a bit harder than the above,
> e.g. by looking for the closest line with the same text as the line
> we're looking for.  Better would be to ask for a diff between the
> annotated revision and the current file and use it to find out the
> line-offset to use (for those cases where this method works).

I'm often in need for a general, customizable function for finding the
best match of some text in two different buffers.  For example, to get
from a texinfo to an info buffer and vice-versa.  Any advances in that
direction would be very appreciated.

martin