Twenty Thirteen: short captions still cover at least 50% of their gallery image

[kwight]

Even if a caption is only a word or two, its fixed height will force it to always cover at least 50% of its image in a single view gallery.

[kwight]

23773.diff:

• no fixed height for captions, only as high as they need to be
• caption has a maximum height of 75%, ensuring there is always clickable space for the image link
• minimum height for the box-shadow, keeping it out of frame for all captions but those at or exceeding the maximum size

[obenland]

I'd vote to leave it at 50% height though, as this is how Joen intended it to be.
Nice patch Kirk!

[kwight]

23773.3.diff: same as 23773.diff, but with a max-height of 50%, and proper ordering (I think?) of declarations.

My pleasure, such a fun design to work on :)

[lancewillett]

In 23701:

Twenty Thirteen: better caption styles for short words and sentences. Props kwight, fixes #23773.