Mentioned in [44165] on Core SVN:
Editor: Merge some minor bug fixes.

Mentioned in [28267] on Core SVN:
Customizer: Avoid hiding 'Remove' buttons unrelated to custom headers.

Mentioned in [28266] on Core SVN:
Customizer: Avoid hiding 'Remove' buttons unrelated to custom headers.

Mentioned in [28102] on Core SVN:
Custom header: Fix image ordering.

Mentioned in [28101] on Core SVN:
Customizer: Fix header image cropping when working with huge images.

Mentioned in [28086] on Core SVN:
Custom Headers: Allow for longer strings.

Mentioned in [28030] on Core SVN:
Header Images: Add suggested dimensions to the media workflow.

Mentioned in [27970] on Core SVN:
Header images: Improve accessibility of Randomize buttons.

Mentioned in [27947] on Core SVN:
Header images: Accessibility and style improvements.

Mentioned in [27946] on Core SVN:
Header images: Handle cropping failures.

Mentioned in [27847] on Core SVN:
Add PHP and JS unit tests for custom headers.

Mentioned in [27497] on Core SVN:
Add header image uploads with cropping to the customizer.

Closed ticket #26505 on Core Trac:
Custom Header cropping code extraction

Created ticket #26505 on Core Trac:
Custom Header cropping code extraction