Log Message:
Update to 1.2.4, from Juan RP in PR 19771:
* Experimental speedup for caption editing. Caches the bg pixmap for the
    image (which doesn't change when you're just editing a caption) so only
    the overlay needs to be re-rendered on each change to the caption.
    Definitely makes a difference when editing captions on a large, fullscreen
    image.
* Tweak event handling - don't nuke queued keyevents when we're accepting
    input for caption entry.
* Fixed wrapping for long lines with no spaces
* Caption editing, also requested by David Blackman <david@whizziwig.com>
    Hit 'c', edit caption, enter to confirm the changes or Escape to revert.
    (Only when --captions-path has been specified).
* Spotted a couple of minor bugs as I went through stuff, fixed those two.
* New option --captions-path. Specify a path (relative to each image) to a
    directory with captions in and feh will overlay them on the image. It even
    does text wrapping and centering!
    Example, run feh --captions-path captions testimages
    for image testimages/donna1.jpg, feh will look for a caption in
    testimages/captions/donna1.jpg.txt
* Fixed bug - segv when last image in slideshow is deleted.