length differences now shown as "X vs. Y"

Previously, they would be shown as "X -> Y", which made multiple users think
that beets was doing something to change the length of the track.

beets/ui/commands.py

@@ -249,7 +249,7 @@ def show_change(cur_artist, cur_album, items, info, dist, color=True,
             if item.length and track_info.length and \
                     abs(item.length - track_info.length) > 2.0:
                 display = True
-                line += u' (%s -> %s)' % (cur_length, new_length)
+                line += u' (%s vs. %s)' % (cur_length, new_length)
             if display:
                 print_(line)
     for i, track_info in missing_tracks:

docs/changelog.rst

@@ -31,6 +31,9 @@ Changelog
   the next import, the (external) files would be moved instead of copied.
 * Artist sort names are now populated correctly for multi-artist tracks and
   releases. (Previously, they only reflected the first artist.)
+* When previewing changes during import, differences in track duration are now
+  shown as "2:50 vs. 3:10" rather than separated with ``->`` like track numbers.
+  This should clarify that beets isn't doing anything to modify lengths.
 * Fix ID3 tag name for the catalog number field.
 * :doc:`/plugins/chroma`: Fix occasional crash at end of fingerprint submission
   and give more context to "failed fingerprint generation" errors.