Reproducible in very recent build as of this message.

The effect of this bug is when I click on a grep target the point moves to one in front of the match.  (assuming compilation-first-column==1, which is the default)

Details:

`compilation-move-to-column' always references `compilation-first-column' when calculating columns.  It should not for "grep" output, because the column # is calculated by `grep-regexp-alist'.


--
Le