PhotoMosaic: improve heuristic for landscape/portrait row

models/PhotoMosaic.php

@@ -165,7 +165,10 @@ class PhotoMosaic
 				return [$photos, 'single'];
 		}
 
-		// A boring set it is, then.
+		// Last resort: majority vote
-		return [$photos, 'row'];
+		if ($num_portrait > $num_landscape)
+			return [$photos, 'portraits'];
+		else
+			return [$photos, 'row'];
 	}
 }