TagDialog: correct rounding for rating

I still wonder how observant our users are. :-)

BUG: 273363
FIXED-IN: 2.6

ChangeLog

@@ -8,6 +8,7 @@ VERSION 2.6
       argument.
 
   BUGFIXES:
+    * Correct rounding for rating in Track Details dialog. (BR 273363)
     * Fix Context view not being fully formed on startup. (BR 292895)
     * Fix memory leaks and a string zero termination issue in MP3tunes.
     * Don't poll for mounts every second, solid notifies us. (BR 289462)

src/dialogs/TagDialog.cpp

@@ -1084,7 +1084,8 @@ TagDialog::getTagsFromMultipleTracks() const
     if( scoreCount > 0 )
         map.insert( Meta::Field::SCORE, scoreSum / scoreCount );
     if( ratingCount > 0 )
-        map.insert( Meta::Field::RATING, ratingSum / ratingCount );
+        // the extra fuzz is for emulating rounding to nearest integer
+        map.insert( Meta::Field::RATING, ( ratingSum + ratingCount / 2 ) / ratingCount );
 
     map.insert( Meta::Field::FIRST_PLAYED, firstPlayed );
     map.insert( Meta::Field::LAST_PLAYED, lastPlayed );