Andrew Ozz 397b2de6e5 Merged revision 42430 from trunk:
Editor: ensure there is a selection before getting the caret position. Fixes a bug in Firefox when there is no selection for a hidden element.

Props johnschulz, azaozz.

Fixes #43012 for 4.9.2.

Built from https://develop.svn.wordpress.org/branches/4.9@42442


git-svn-id: http://core.svn.wordpress.org/branches/4.9@42272 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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