Move a `<code>` tag out of a localised string on the About page.

Merges [30903] to the 4.1 branch.

Props pavelevap
See #30435

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TinyMCE: remove reposition delay on showing the image toolbar. Not needed when no animation.

Merges [30829] to the 4.1 branch.

Fixes #30670.

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Do not autofocus text fields on page load on mobile devices. This is currently broken in many mobile browsers:
- iOS Safari opens the keyboard and auto-scrolls on the first tap anywhere on the screen triggering the click at an unexpected place. That makes it impossible to follow links or press buttons.
- Chrome on iOS opens the keyboard on load and may scroll the focused field off screen.
- The Android 4.4 browser only highlights the field, the user has to tap it to open the keyboard and type.

Merges [30842] to the 4.1 branch.

See #30703.

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iOS: do not autofocus the readonly textarea with the code for wp-config.php in setup-config.php.

Merges [30843] to the 4.1 branch.

Fixes #30703.

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Customizer: Re-add the possibility to remove and restore a default background image.

Merges [30849] to the 4.1 branch.

Fixes #30683

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Revert [30036].

Merges [30912] to the 4.1 branch.

see #18035
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Remove caching for `get_term_by()` calls.

The new cache group scheme causes term invalidation to be overly broad, so
that busting the cache for one term will bust the cache for all terms in the
taxonomy. We'll have another go at more focused use of the 'last_changed'
incrementor in a future release.

Reverts [29915], [30073], [30080], [30108], [30112].

Merges [30900] to the 4.1 branch.

See #21760.

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Customizer: Remove date filter from the Header/Background Image upload frames.

Adds an option to `wp.media.view.AttachmentsBrowser` to hide the date filter added in [29813].

Merges [30872] to the 4.1 branch.

See #30689.

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Customizer: Import missing `wp.customize.Control.prototype._toggleActive`.

Check also if `completeCallback` is set before calling it.

Merges [30871] to the 4.1 branch.

Props westonruter.
See #30701.

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Fix menu shakiness when over-scrolling in Chrome and Safari on MacOS.

Merges [30844] to the 4.1 branch.

See #30692.

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Improve the fix for menu shakiness when over-scrolling. Recalculate heights on editor auto-resize.

Merges [30852] to the 4.1 branch.

See #30692.

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Background Updates: Pass back whether Group Writable support is being leveraged for an update to the WordPress.org API.

Merges [30860] to the 4.1 branch.

See #30245

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