* Use `postMessage` transport for header image settings by default when video headers are supported, and thus `the_custom_header_markup()` will necessarily be used (and thus a selective refresh partial will be available).
* Ensure that `the_custom_header_markup()` always outputs a container element in the customizer preview even if the header is empty.
* Ensure that edit shortcut appearing for custom header does not get positioned off-screen.
Props bradyvercher, westonruter.
See #38639.
Fixes#38737.
Built from https://develop.svn.wordpress.org/trunk@39227
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Removes the `.customize-partial-edit-shortcut-left-margin` class which was not effective on some themes, created a worse experience for other themes, and which did not recalculate when the preview was reflowed or resized. Now some small-width media queries are added to handle common cases while more dramatic issues can be handled by the theme. Also renames `Partial.positionEditShortcut()`to `Partial.addEditShortcutToPlacement()` which is a more accurate description of its function.
Props sirbrillig, sstoqnov.
See #38651, #27403.
Built from https://develop.svn.wordpress.org/trunk@39202
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Currently, the "Collapse menu" item is not focusable and keyboard users can't collapse/expand the admin menu. This aims to fix it so that screen readers no longer announce it as a clickable but it remains unfocusable and thus unusable. So it's now a button.
Quoting joedolson at WordCamp Chicago 2014:
"If it's supposed to act like a button, it should be a button."
Also includes a grunt:precommit run that picked up some postcss changes to src/wp-includes/css/customize-preview.css
Fixes#29958.
Props ajercia, ipm-frommen for an iterative patch, valendesigns for an iterative patch, GaryJ for feedback, joedolson for feedback, helen for feedback
Built from https://develop.svn.wordpress.org/trunk@39141
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* Edit shortcuts show initially for a moment and then fade away so as to not get in the way of the preview.
* Visibility of edit shortcuts is toggled by clicking/touching anywhere inert in the document.
* Implements UI for mobile and touch devices which do not support shift-click.
* Adds `editShortcutVisibility` state.
* Adds new methods to `wp.customize.selectiveRefresh.Partial` for managing edit shortcuts.
Incorporates aspects of the Customize Direct Manipulation feature plugin.
Props sirbrillig, mattwiebe, celloexpressions, melchoyce, westonruter, afercia.
Fixes#27403.
Built from https://develop.svn.wordpress.org/trunk@38967
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Weston Ruter
Aaron Jorbin