bug#34621: Patch Update

[Drew Adams]

> The reason for special casing dired is to stop rgrep taking extension
> suggestions from dired buffers, e.g. suggesting "*.11" as the rgrep
> file pattern in a dired buffer called "django-1.11".

I see.  It sounds like `rgrep' should itself be changed
to be more flexible or smarter, or to let users more
easily control the default file-name pattern.

It doesn't sound to me like this has anything, per se,
to do with Dired.  It has to do with how the default is
determined, and that's apparently now being picked up
from the buffer name.