gf (+lookup/file) has been changed to:
+ Use the active selection instead of the filename-at-point when
searching for a file (as requested in #4942).
+ Pre-fill the FFAP prompt with the thing at point if no obvious
filepath can be guessed from it (via ffap-alist).
+ Offer to search the current project for the thing-at-point (if
counsel-file-jump is available).
+ Fall back to a standard ffap prompt if all else fails.
I've also reversed te order of file lookup backends so that our FFAP
backend is treated as a never-failing last resort (also because the
bug-reference backend is known to fail gracefully, so we can trust it to
run first).
Closes#4942
259cf83ef1