Twenty Fifteen: Reflect the change from "no" to "share" icon in [30810] in readme.txt.

props iamtakashi.
fixes #30148.
Built from https://develop.svn.wordpress.org/trunk@30828


git-svn-id: http://core.svn.wordpress.org/trunk@30818 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE: remove reposition delay on showing the image toolbar. Not needed when no animation. Fixes #30670.
Built from https://develop.svn.wordpress.org/trunk@30829


git-svn-id: http://core.svn.wordpress.org/trunk@30819 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix search box position on the Add Plugins screen after resizing the window to narrower than 1000px and then back to wider than 1200px. Fixes #30658.
Built from https://develop.svn.wordpress.org/trunk@30830


git-svn-id: http://core.svn.wordpress.org/trunk@30820 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revisions: Fix initial state of `compareTwoMode`.

Broken since [30131].

fixes #30672.
Built from https://develop.svn.wordpress.org/trunk@30831


git-svn-id: http://core.svn.wordpress.org/trunk@30821 1a063a9b-81f0-0310-95a4-ce76da25c4cd