I just ran the static analyser over the source code
of thunar-vfs-1.2.0

It said

[thunar-vfs-thumb-jpeg.c:427] -> [thunar-vfs-thumb-jpeg.c:425]: (style) Duplicate conditions in 'if' and related 'else if'.

Source code is

          if (tag == 0x0100)
            exif->thumb.thumb_tiff.width = value;
          else if (tag == 0x0100)
            exif->thumb.thumb_tiff.height = value;

Suggest change 2nd if.