Prevent Extended Info text moving horiz: Closes bgo#718901
Prevent Extended Info text moving horiz: Closes bgo#718901

This prevents the text from moving horizontally when adding the
additional fields Shotwell displays for RAW photos.  Only
vertical space is added (or removed).

jimbonator/shotwell,jimbonator/shotwell,abrauchli/shotwell,abrauchli/shotwell,jimbonator/shotwell,abrauchli/shotwell