filemerge: rename _formatconflictmarker() since it formats a label...
filemerge: rename _formatconflictmarker() since it formats a label
`_formatconflictmarker()`'s name made me think that it would create
something like `<<<<<<<` and maybe some more stuff after it, but it's
actually just the label that comes after on the same line. So let's
rename it to `_formatlabel()`. That's better aligned with the
variables the result is assigned it.
Differential Revision:
https://phab.mercurial-scm.org/D11801
