Install Plugins: Don't wp_die() if API can't be reached.

props johnbillion.
fixes #29361.
Built from https://develop.svn.wordpress.org/trunk@29594


git-svn-id: http://core.svn.wordpress.org/trunk@29368 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugins: Only show details link if user can install plugins.

fixes #17902.

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git-svn-id: http://core.svn.wordpress.org/trunk@29369 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Make filter bar CSS less verbose and redundant.

Also removes an unused handler in the theme feature filter.

see #28794.

Built from https://develop.svn.wordpress.org/trunk@29596


git-svn-id: http://core.svn.wordpress.org/trunk@29370 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Only show one search form for the plugin installer.

The field dropdown now appears in the filter bar only when doing a search.

see #28785.

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git-svn-id: http://core.svn.wordpress.org/trunk@29371 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: Move CSS into an admin-only file.

`media-views.css` can be loaded on the front, which does not need this extra CSS.

fixes #29340.

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git-svn-id: http://core.svn.wordpress.org/trunk@29372 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Send nocache_headers() on installation screens and when redirecting to them.

fixes #29248.
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git-svn-id: http://core.svn.wordpress.org/trunk@29373 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: exit selection mode when Esc is pressed.

Fixes #29366.

Built from https://develop.svn.wordpress.org/trunk@29600


git-svn-id: http://core.svn.wordpress.org/trunk@29374 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media: when activating a mode after [29056], don't trigger the `{mode}:activate` event twice in a row.

See #29366.

Built from https://develop.svn.wordpress.org/trunk@29601


git-svn-id: http://core.svn.wordpress.org/trunk@29375 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media: cleanup recent changes to `media.view.FocusManager`.

* Adjusts the focus method to target the menu for the current modal
* Refactor the FocusManager so that the method names and the functionality matches more closely with how it currently works. The changes in 4.0 to the FocusManager change the purpose of the focus manager entirely — instead of being a way to save and restore focus state, the new FocusManager is about constraining keyboard navigation via the tab key to inside the modal. 

Props gcorne.
See #23560.

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git-svn-id: http://core.svn.wordpress.org/trunk@29376 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media modal: when inserting content, prefer the editor id passed while opening the modal. wpActiveEditor can change in the background. (Includes some precommit prefixed selectors.) Fixes #28173
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git-svn-id: http://core.svn.wordpress.org/trunk@29377 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct cascade oversights in form CSS. fixes #28262.

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git-svn-id: http://core.svn.wordpress.org/trunk@29378 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Plugin details:

Prevent plugins with long names from looking bad and breaking layouts.

props stephdau. fixes #28883.

Built from https://develop.svn.wordpress.org/trunk@29605


git-svn-id: http://core.svn.wordpress.org/trunk@29379 1a063a9b-81f0-0310-95a4-ce76da25c4cd
TinyMCE wpView: exclude more non-printable keyCodes in isSpecialKey(), fixes #29115
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git-svn-id: http://core.svn.wordpress.org/trunk@29380 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media:

* Make attachment focus styles more obvious, particularly for already selected items.
* Fix styling for the selection set attachments.
* Remove some CSS cruft.

fixes #28822.

Built from https://develop.svn.wordpress.org/trunk@29607


git-svn-id: http://core.svn.wordpress.org/trunk@29381 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Better visual focus syling in customizer, theme preview, and attachment details modals.

props celloexpressions.
fixes #29147.

Built from https://develop.svn.wordpress.org/trunk@29608


git-svn-id: http://core.svn.wordpress.org/trunk@29382 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media modal: fix the progress bar in the attachment thumbnail. Props gcorne, fixes #29367
Built from https://develop.svn.wordpress.org/trunk@29609


git-svn-id: http://core.svn.wordpress.org/trunk@29383 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Customizer panels: use a single back button for all panels.

This also ensures the back button is visible on iOS devices.

props celloexpressions.
fixes #29135.

Built from https://develop.svn.wordpress.org/trunk@29610


git-svn-id: http://core.svn.wordpress.org/trunk@29384 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Install: Remove reference to readme and add a hyphen missing since 2007.

props ocean90.
fixes #29290.

Built from https://develop.svn.wordpress.org/trunk@29611


git-svn-id: http://core.svn.wordpress.org/trunk@29385 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: Show upload errors above the grid rather than as a popup.

props pento, stephdau, helen. fixes #29141.

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git-svn-id: http://core.svn.wordpress.org/trunk@29386 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Modal: 

* the Image Details frame does not have a menu, indicate that by setting `menu: false` when adding states.
* mimic the default router rendering by toggling a `hide-menu` class on the frame when the region for menu is `null`
* remove the dead render code for the Image Details frame

See #29339.

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