Editor expand: hide TinyMCE float panels and tooltips when scrolling.

Merges [29738] to the 4.0 branch.

props avryl.
see #29516.

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TinyMCE wpView: when pasting/inserting content before a view, add new paragraph above it and insert the content there.

Merges [29766] to the 4.0 branch.

props avryl.
fixes #29380.

Built from https://develop.svn.wordpress.org/branches/4.0@30257


git-svn-id: http://core.svn.wordpress.org/branches/4.0@30257 1a063a9b-81f0-0310-95a4-ce76da25c4cd