Drew Jaynes 444cb81b45 Update/Install: Provide basic back-compat styling for the .update-message CSS class in the plugins list table.
This change restores only the margin and padding styles for the `.update-message` class when used by plugins in the context of adding arbitrary rows to the list table. The inline-update colors and icon styles were not restored, expressly with a wide variety of plugin use-cases in mind.

Merge of [38237] to the 4.6 branch.

Props ovann86, rahulsprajapati, ocean90, DrewAPicture.
Props helen for review.
Fixes #37504. 

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git-svn-id: http://core.svn.wordpress.org/branches/4.6@38179 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-08-09 22:49:33 +00:00
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