DFW: fade in triggered when typing while mouse is outside editor

[iseulde]

​https://wordpress.slack.com/archives/feature-focus/p1418251444000002

[iseulde]

Above patch only fixes is partially. Working on other patch.

[iseulde]

Clarification: If we use clientX/Y the coordinates will be the same when the mousemove event is fired alongside the scroll event for Chrome and Safari. But it still fades in when typing more because editorRect doesn't get updated.

[iseulde]

This should fix it. Testing a bit more.

[azaozz]

30668.3.patch looks good.

[iseulde]

Patch 4 only removes an empty line I accidentally added.

[markjaquith]

In [30817]:

Editor focus: Don't trigger when typing while the mouse is outside the editor.
props avryl.
fixes #30668.

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In [30818]:

Editor focus: Don't trigger when typing while the mouse is outside the editor.
Merges [30817] to the 4.1 branch.
props avryl.
fixes #30668.