Disable background page scrolling when modals are open.

props celloexpressions.
fixes #29074.
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git-svn-id: http://core.svn.wordpress.org/trunk@29124 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugin install: Add missing closing HTML tags.

props jwenerd.
fixes #29090. see #28673.
Built from https://develop.svn.wordpress.org/trunk@29348


git-svn-id: http://core.svn.wordpress.org/trunk@29125 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid an undefined index notice in wp_reschedule_event().

props paulschreiber.
fixes #29077.
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git-svn-id: http://core.svn.wordpress.org/trunk@29126 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add some braces to [29225]. 

see #28673.
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git-svn-id: http://core.svn.wordpress.org/trunk@29127 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Editor scrolling: run one more adjust() 200ms after scroll or resize in case the browser is slow to re-calculate the element heights and pin/unpin the toolbars. See #28328, fixes #29059.
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git-svn-id: http://core.svn.wordpress.org/trunk@29128 1a063a9b-81f0-0310-95a4-ce76da25c4cd
RTL: Fix media attach modal alignment.

props SergeyBiryukov.
fixes #28010.
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git-svn-id: http://core.svn.wordpress.org/trunk@29129 1a063a9b-81f0-0310-95a4-ce76da25c4cd
To improve troubleshooting use `esc_html()` for a failed embed.

see #28195.
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git-svn-id: http://core.svn.wordpress.org/trunk@29130 1a063a9b-81f0-0310-95a4-ce76da25c4cd