Autosave: don't set "submit" buttons to disabled right before submitting the form. They are not sent with the form data, see #25272.

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Let `is_attachment()` accept an $attachment parameter, similar to `is_page()` and `is_single()`. Adds Unit Tests for all 3.

Props alex-ye for the initial patch.
Fixes #24257.


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Fix a bit of whitespace from [27016].


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Fix imperceptible whitespace cruff from [27017].


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Fix typo in CSS. props ciantic, MikeHansenMe. fixes #26898.
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Properly detect line height of Quick Draft textarea.

props batmoo.
fixes #26915 for trunk.

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Docs fix: edit_comment_link() doesn't actually return anything.

props Corphi.
fixes #26436.

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