fix(dirvish): mark-all-visible no longer skips every other file

dired-mark advances point itself, so the loop's extra forward-line skipped every other file (and could mark a directory). Use dired-get-filename + file-directory-p with an if/else: a marked file line advances once via dired-mark, non-file/directory lines advance manually. Replaces the regex line predicate (retired with its mock test) with a real-Dired marked-count test.

0 files changed, 0 insertions, 0 deletions