Fix JSHint errors in postbox.js.

props atimmer.
fixes #26006.

Built from https://develop.svn.wordpress.org/trunk@26167


git-svn-id: http://core.svn.wordpress.org/trunk@26077 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Heartbeat: clean up code style, better naming, better code structure. Props carldanley, props evansolomon.
Changes:
- Add connectNow() public method to trigger a connection immediately.
- Remove the "skipping" when no data to send.
- Change the default interval to 60 sec.
- Fix resetting the next connection time when changing the interval.
See #25073.
Built from https://develop.svn.wordpress.org/trunk@26169


git-svn-id: http://core.svn.wordpress.org/trunk@26078 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add a :disabled style for radio inputs and checkboxes. Fixes #26004.


Built from https://develop.svn.wordpress.org/trunk@26170


git-svn-id: http://core.svn.wordpress.org/trunk@26079 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Replace icon-pointer-flag.png with the flag Dashicon. Fixes #25982.


Built from https://develop.svn.wordpress.org/trunk@26171


git-svn-id: http://core.svn.wordpress.org/trunk@26080 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In bulk editing mode, make all columns full-width and increase the font size when at responsive sizes. Fixes #25978, props johnbillion.


Built from https://develop.svn.wordpress.org/trunk@26172


git-svn-id: http://core.svn.wordpress.org/trunk@26081 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make the menu location screen full-width at responsive sizes. Fixes #25975, props johnbillion.


Built from https://develop.svn.wordpress.org/trunk@26173


git-svn-id: http://core.svn.wordpress.org/trunk@26082 1a063a9b-81f0-0310-95a4-ce76da25c4cd
JSHint and coding style fixes for xfn.js.

props dougwollison.
fixes #26030.

Built from https://develop.svn.wordpress.org/trunk@26174


git-svn-id: http://core.svn.wordpress.org/trunk@26083 1a063a9b-81f0-0310-95a4-ce76da25c4cd
More specific CSS for the dashboard activity widget.

props iammattthomas.
see #26028.

Built from https://develop.svn.wordpress.org/trunk@26175


git-svn-id: http://core.svn.wordpress.org/trunk@26084 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Move #wpadminbar responsive styles from wp-admin.css to admin-bar.css. Remove unneeded font overrides and !importants where possible. Make sure the site menu item uses the globe icon consistently instead of switching to the home icon <782px. Fixes #25971.


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git-svn-id: http://core.svn.wordpress.org/trunk@26085 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Move the responsive padding for html.wp-toolbar to wp-admin.css since it affects the page content, not the toolbar.
Built from https://develop.svn.wordpress.org/trunk@26177


git-svn-id: http://core.svn.wordpress.org/trunk@26086 1a063a9b-81f0-0310-95a4-ce76da25c4cd