WP 5.6.2 backports

[tellthemachines]

Description

Fixes included:

#26475
#26583
#26447
#28621
#27777

How has this been tested?

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[github-actions]

Size Change: -184 B (0%)

Total Size: 1.2 MB

Filename	Size	Change
build/block-editor/style-rtl.css	10.9 kB	-18 B (0%)
build/block-editor/style.css	10.9 kB	-18 B (0%)
build/block-library/editor-rtl.css	8.97 kB	-3 B (0%)
build/block-library/editor.css	8.97 kB	-2 B (0%)
build/block-library/style-rtl.css	7.72 kB	-31 B (0%)
build/block-library/style.css	7.72 kB	-30 B (0%)
build/components/index.js	170 kB	+67 B (0%)
build/components/style-rtl.css	15.4 kB	-35 B (0%)
build/components/style.css	15.3 kB	-35 B (0%)
build/core-data/index.js	12.2 kB	+9 B (0%)
build/edit-post/style-rtl.css	6.41 kB	-22 B (0%)
build/edit-post/style.css	6.4 kB	-22 B (0%)
build/edit-site/style-rtl.css	3.84 kB	-13 B (0%)
build/edit-site/style.css	3.84 kB	-14 B (0%)
build/edit-widgets/index.js	26.6 kB	-2 B (0%)
build/edit-widgets/style-rtl.css	3.12 kB	-13 B (0%)
build/edit-widgets/style.css	3.12 kB	-12 B (0%)
build/editor/style-rtl.css	3.84 kB	-6 B (0%)
build/editor/style.css	3.84 kB	-6 B (0%)
build/media-utils/index.js	5.14 kB	+22 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
build/a11y/index.js	1.14 kB	0 B
build/annotations/index.js	3.54 kB	0 B
build/api-fetch/index.js	3.35 kB	0 B
build/autop/index.js	2.72 kB	0 B
build/blob/index.js	668 B	0 B
build/block-directory/index.js	8.6 kB	0 B
build/block-directory/style-rtl.css	943 B	0 B
build/block-directory/style.css	942 B	0 B
build/block-editor/index.js	130 kB	0 B
build/block-library/index.js	144 kB	0 B
build/block-library/theme-rtl.css	741 B	0 B
build/block-library/theme.css	741 B	0 B
build/block-serialization-default-parser/index.js	1.77 kB	0 B
build/block-serialization-spec-parser/index.js	3.1 kB	0 B
build/blocks/index.js	47.7 kB	0 B
build/compose/index.js	9.63 kB	0 B
build/data-controls/index.js	684 B	0 B
build/data/index.js	8.62 kB	0 B
build/date/index.js	31.9 kB	0 B
build/deprecated/index.js	772 B	0 B
build/dom-ready/index.js	569 B	0 B
build/dom/index.js	4.43 kB	0 B
build/edit-navigation/index.js	10.6 kB	0 B
build/edit-navigation/style-rtl.css	868 B	0 B
build/edit-navigation/style.css	871 B	0 B
build/edit-post/index.js	306 kB	0 B
build/edit-site/index.js	21.6 kB	0 B
build/editor/editor-styles-rtl.css	480 B	0 B
build/editor/editor-styles.css	482 B	0 B
build/editor/index.js	42.7 kB	0 B
build/element/index.js	4.45 kB	0 B
build/escape-html/index.js	733 B	0 B
build/format-library/index.js	7.49 kB	0 B
build/format-library/style-rtl.css	547 B	0 B
build/format-library/style.css	548 B	0 B
build/hooks/index.js	1.74 kB	0 B
build/html-entities/index.js	622 B	0 B
build/i18n/index.js	3.54 kB	0 B
build/is-shallow-equal/index.js	709 B	0 B
build/keyboard-shortcuts/index.js	2.39 kB	0 B
build/keycodes/index.js	1.85 kB	0 B
build/list-reusable-blocks/index.js	3.02 kB	0 B
build/list-reusable-blocks/style-rtl.css	476 B	0 B
build/list-reusable-blocks/style.css	476 B	0 B
build/notices/index.js	1.69 kB	0 B
build/nux/index.js	3.27 kB	0 B
build/nux/style-rtl.css	671 B	0 B
build/nux/style.css	668 B	0 B
build/plugins/index.js	2.44 kB	0 B
build/primitives/index.js	1.35 kB	0 B
build/priority-queue/index.js	789 B	0 B
build/redux-routine/index.js	2.85 kB	0 B
build/reusable-blocks/index.js	3.06 kB	0 B
build/rich-text/index.js	13 kB	0 B
build/server-side-render/index.js	2.61 kB	0 B
build/shortcode/index.js	1.7 kB	0 B
build/token-list/index.js	1.24 kB	0 B
build/url/index.js	4.06 kB	0 B
build/viewport/index.js	1.75 kB	0 B
build/warning/index.js	1.13 kB	0 B
build/wordcount/index.js	1.23 kB	0 B

_{compressed-size-action}

[talldan]

Looks good, thanks for wrangling this!