Customizer: Avoid losing focus when adding widgets via keyboard.

props sathishn.
fixes #28835.
Built from https://develop.svn.wordpress.org/trunk@29237


git-svn-id: http://core.svn.wordpress.org/trunk@29021 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Add widget title to Move/Up/Down controls to provide context for screen readers when reordering or moving widgets.

fixes #28889.
Built from https://develop.svn.wordpress.org/trunk@29238


git-svn-id: http://core.svn.wordpress.org/trunk@29022 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add screen reader text to announce that menu item accordion sections are expandable. Remove redundant title attribute.

props joedolson.
fixes #28866.
Built from https://develop.svn.wordpress.org/trunk@29239


git-svn-id: http://core.svn.wordpress.org/trunk@29023 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Add screen reader text to announce that panels and sections are expandable.

props joedolson, ocean90.
fixes #27591.
Built from https://develop.svn.wordpress.org/trunk@29240


git-svn-id: http://core.svn.wordpress.org/trunk@29024 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add a class for get_comment_author_link() in Recent Comments widget.

props DrewAPicture, dannydehaan, 5um17.
fixes #27944.
Built from https://develop.svn.wordpress.org/trunk@29241


git-svn-id: http://core.svn.wordpress.org/trunk@29025 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: When widget reorder button is actioned, transfer focus to the first Move control within the section.

fixes #28891.
Built from https://develop.svn.wordpress.org/trunk@29242


git-svn-id: http://core.svn.wordpress.org/trunk@29026 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer: Remove "Add a Widget" button from tab order when reordering widgets.

fixes #28890.
Built from https://develop.svn.wordpress.org/trunk@29243


git-svn-id: http://core.svn.wordpress.org/trunk@29027 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove redundant title attributes from get_calendar().

props joedolson.
fixes #26561.
Built from https://develop.svn.wordpress.org/trunk@29244


git-svn-id: http://core.svn.wordpress.org/trunk@29028 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE wpVIew: use CSS3 `currentcolor` for the fake carets, see #28595.
Built from https://develop.svn.wordpress.org/trunk@29245


git-svn-id: http://core.svn.wordpress.org/trunk@29029 1a063a9b-81f0-0310-95a4-ce76da25c4cd