Improvements to hover and focus states on the adminbar:

* Add a clear hover state for top-level links in the adminbar.
* Add :focus styles to the adminbar for keyboard accessibility.
* Ensure that the username link in the profile submenu gets a :hover style.
* Add adminbar hover styles to color schemes.
* Set -webkit-font-smoothing to subpixel-antialiased on the adminbar so that Safari doesn't switch to standard antialiasing on mouseover.

Fixes #26152, props ryelle.


Built from https://develop.svn.wordpress.org/trunk@26407


git-svn-id: http://core.svn.wordpress.org/trunk@26307 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Keep the resize handle from jumping around when switching between the Visual and Text editors. Fixes #26246, props mattheu.


Built from https://develop.svn.wordpress.org/trunk@26408


git-svn-id: http://core.svn.wordpress.org/trunk@26308 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: fix image alignment in editor styles, props azaozz and RDall. Fixes #26108.
Built from https://develop.svn.wordpress.org/trunk@26409


git-svn-id: http://core.svn.wordpress.org/trunk@26309 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Restore the bottom border to .wp-editor-container so it's not missing when the editor appears outside the main editor container. Fixes #26241, props mattheu.
Built from https://develop.svn.wordpress.org/trunk@26410


git-svn-id: http://core.svn.wordpress.org/trunk@26310 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Better alignment of Visual and Text tabs with editor, better alignment of word count container with editor, eliminate gap between tabs and editor on Press This. Fixes #26238, props mattheu.
Built from https://develop.svn.wordpress.org/trunk@26411


git-svn-id: http://core.svn.wordpress.org/trunk@26311 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Adjust the mceResize handle so it matches the handle on the plain text editor. See #26241.
Built from https://develop.svn.wordpress.org/trunk@26412


git-svn-id: http://core.svn.wordpress.org/trunk@26312 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Reintroduce a drop zone indicator in empty sidebars on the Widgets page. Fixes #26168, props shaunandrews.
Built from https://develop.svn.wordpress.org/trunk@26413


git-svn-id: http://core.svn.wordpress.org/trunk@26313 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Eliminate the transition animation on the responsive sidebar; set the responsive sidebar to display: none by default so it doesn't appear momentarily when loading the page. Fixes #25969.


Built from https://develop.svn.wordpress.org/trunk@26414


git-svn-id: http://core.svn.wordpress.org/trunk@26314 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Match the background color of the responsive toggle button active state to -submenu-background, so it matches color schemes. See #25858.
Built from https://develop.svn.wordpress.org/trunk@26415


git-svn-id: http://core.svn.wordpress.org/trunk@26315 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Hide registered and users columns in Sites table on small screens to prevent columms from becoming too narrow. Fixes #25973, props johnbillion.
Built from https://develop.svn.wordpress.org/trunk@26416


git-svn-id: http://core.svn.wordpress.org/trunk@26316 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove gradients and text-shadow from ui-slider-handle and restyle it to mimic buttons. Match the background color to the chosen color scheme's -color. See #25858.
Built from https://develop.svn.wordpress.org/trunk@26417


git-svn-id: http://core.svn.wordpress.org/trunk@26317 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix typo in a comment. props kovshenin. fixes #26266.
Built from https://develop.svn.wordpress.org/trunk@26418


git-svn-id: http://core.svn.wordpress.org/trunk@26318 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Admin pointers don't work at responsive sizes because of responsive layout adjustments. Hide the pointers for now until they're made responsive. Fixes #25984.
Built from https://develop.svn.wordpress.org/trunk@26419


git-svn-id: http://core.svn.wordpress.org/trunk@26319 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Unify the style of button-small everywhere we use it, and make sure the edit slug input lines up with its button and label. Fixes #26261, props mattheu.
Built from https://develop.svn.wordpress.org/trunk@26420


git-svn-id: http://core.svn.wordpress.org/trunk@26320 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove cloning of the search box with JS and move it to the bottom of the screen with CSS instead, see #26086
Built from https://develop.svn.wordpress.org/trunk@26421


git-svn-id: http://core.svn.wordpress.org/trunk@26321 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Match current theme background and add theme hover state color to the highlight color in color schemes. Fixes #25967, props ryelle.
Built from https://develop.svn.wordpress.org/trunk@26422


git-svn-id: http://core.svn.wordpress.org/trunk@26322 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Prevent horizontal scrolling when the responsive sidebar is open, pushing the main column off to the right. See #25858.
Built from https://develop.svn.wordpress.org/trunk@26423


git-svn-id: http://core.svn.wordpress.org/trunk@26323 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct the alignment of sortable list table headers. Fixes #26131, props jeremyfelt.
Built from https://develop.svn.wordpress.org/trunk@26424


git-svn-id: http://core.svn.wordpress.org/trunk@26324 1a063a9b-81f0-0310-95a4-ce76da25c4cd