FSE: fix iframe error in Firefox

[ellatrix]

Description

Ref should be set before state update, which could happen synchronously.

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.
• 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: 0 B

Total Size: 1.28 MB

ℹ️ View Unchanged

Filename	Size	Change
build/a11y/index.js	1.14 kB	0 B
build/annotations/index.js	3.8 kB	0 B
build/api-fetch/index.js	3.42 kB	0 B
build/autop/index.js	2.83 kB	0 B
build/blob/index.js	665 B	0 B
build/block-directory/index.js	9.07 kB	0 B
build/block-directory/style-rtl.css	1.01 kB	0 B
build/block-directory/style.css	1.01 kB	0 B
build/block-editor/index.js	122 kB	0 B
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build/block-editor/style.css	11.6 kB	0 B
build/block-library/blocks/archives/editor-rtl.css	196 B	0 B
build/block-library/blocks/archives/editor.css	196 B	0 B
build/block-library/blocks/audio/editor-rtl.css	194 B	0 B
build/block-library/blocks/audio/editor.css	194 B	0 B
build/block-library/blocks/audio/style-rtl.css	225 B	0 B
build/block-library/blocks/audio/style.css	225 B	0 B
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build/block-library/blocks/cover/editor.css	522 B	0 B
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build/block-library/blocks/cover/style.css	1.3 kB	0 B
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build/block-library/blocks/embed/style.css	489 B	0 B
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build/block-library/blocks/file/style.css	352 B	0 B
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build/block-library/blocks/gallery/editor.css	750 B	0 B
build/block-library/blocks/gallery/style-rtl.css	1.17 kB	0 B
build/block-library/blocks/gallery/style.css	1.17 kB	0 B
build/block-library/blocks/group/editor-rtl.css	433 B	0 B
build/block-library/blocks/group/editor.css	432 B	0 B
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build/block-library/blocks/image/editor.css	800 B	0 B
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build/block-library/blocks/latest-comments/style-rtl.css	382 B	0 B
build/block-library/blocks/latest-comments/style.css	382 B	0 B
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build/block-library/blocks/latest-posts/editor.css	254 B	0 B
build/block-library/blocks/latest-posts/style-rtl.css	634 B	0 B
build/block-library/blocks/latest-posts/style.css	634 B	0 B
build/block-library/blocks/list/editor-rtl.css	203 B	0 B
build/block-library/blocks/list/editor.css	203 B	0 B
build/block-library/blocks/list/style-rtl.css	201 B	0 B
build/block-library/blocks/list/style.css	201 B	0 B
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build/block-library/blocks/media-text/editor.css	311 B	0 B
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build/block-library/blocks/more/editor-rtl.css	545 B	0 B
build/block-library/blocks/more/editor.css	545 B	0 B
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build/block-library/blocks/post-author/editor-rtl.css	329 B	0 B
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build/block-library/blocks/post-comments-form/style-rtl.css	358 B	0 B
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build/block-library/blocks/post-content/editor.css	262 B	0 B
build/block-library/blocks/post-excerpt/editor-rtl.css	206 B	0 B
build/block-library/blocks/post-excerpt/editor.css	206 B	0 B
build/block-library/blocks/post-featured-image/editor-rtl.css	453 B	0 B
build/block-library/blocks/post-featured-image/editor.css	453 B	0 B
build/block-library/blocks/post-featured-image/style-rtl.css	223 B	0 B
build/block-library/blocks/post-featured-image/style.css	223 B	0 B
build/block-library/blocks/preformatted/style-rtl.css	193 B	0 B
build/block-library/blocks/preformatted/style.css	193 B	0 B
build/block-library/blocks/pullquote/editor-rtl.css	304 B	0 B
build/block-library/blocks/pullquote/editor.css	304 B	0 B
build/block-library/blocks/pullquote/style-rtl.css	428 B	0 B
build/block-library/blocks/pullquote/style.css	428 B	0 B
build/block-library/blocks/query-loop/editor-rtl.css	217 B	0 B
build/block-library/blocks/query-loop/editor.css	216 B	0 B
build/block-library/blocks/query-loop/style-rtl.css	427 B	0 B
build/block-library/blocks/query-loop/style.css	429 B	0 B
build/block-library/blocks/query/editor-rtl.css	279 B	0 B
build/block-library/blocks/query/editor.css	279 B	0 B
build/block-library/blocks/quote/editor-rtl.css	195 B	0 B
build/block-library/blocks/quote/editor.css	195 B	0 B
build/block-library/blocks/quote/style-rtl.css	284 B	0 B
build/block-library/blocks/quote/style.css	285 B	0 B
build/block-library/blocks/rss/editor-rtl.css	307 B	0 B
build/block-library/blocks/rss/editor.css	309 B	0 B
build/block-library/blocks/rss/style-rtl.css	394 B	0 B
build/block-library/blocks/rss/style.css	393 B	0 B
build/block-library/blocks/search/editor-rtl.css	285 B	0 B
build/block-library/blocks/search/editor.css	285 B	0 B
build/block-library/blocks/search/style-rtl.css	454 B	0 B
build/block-library/blocks/search/style.css	456 B	0 B
build/block-library/blocks/separator/editor-rtl.css	229 B	0 B
build/block-library/blocks/separator/editor.css	229 B	0 B
build/block-library/blocks/separator/style-rtl.css	352 B	0 B
build/block-library/blocks/separator/style.css	352 B	0 B
build/block-library/blocks/shortcode/editor-rtl.css	603 B	0 B
build/block-library/blocks/shortcode/editor.css	603 B	0 B
build/block-library/blocks/site-logo/editor-rtl.css	321 B	0 B
build/block-library/blocks/site-logo/editor.css	321 B	0 B
build/block-library/blocks/site-logo/style-rtl.css	238 B	0 B
build/block-library/blocks/site-logo/style.css	238 B	0 B
build/block-library/blocks/social-link/editor-rtl.css	283 B	0 B
build/block-library/blocks/social-link/editor.css	283 B	0 B
build/block-library/blocks/social-links/editor-rtl.css	811 B	0 B
build/block-library/blocks/social-links/editor.css	810 B	0 B
build/block-library/blocks/social-links/style-rtl.css	1.44 kB	0 B
build/block-library/blocks/social-links/style.css	1.44 kB	0 B
build/block-library/blocks/spacer/editor-rtl.css	416 B	0 B
build/block-library/blocks/spacer/editor.css	416 B	0 B
build/block-library/blocks/spacer/style-rtl.css	184 B	0 B
build/block-library/blocks/spacer/style.css	184 B	0 B
build/block-library/blocks/subhead/editor-rtl.css	223 B	0 B
build/block-library/blocks/subhead/editor.css	223 B	0 B
build/block-library/blocks/subhead/style-rtl.css	210 B	0 B
build/block-library/blocks/subhead/style.css	210 B	0 B
build/block-library/blocks/table/editor-rtl.css	593 B	0 B
build/block-library/blocks/table/editor.css	593 B	0 B
build/block-library/blocks/table/style-rtl.css	501 B	0 B
build/block-library/blocks/table/style.css	501 B	0 B
build/block-library/blocks/tag-cloud/editor-rtl.css	237 B	0 B
build/block-library/blocks/tag-cloud/editor.css	235 B	0 B
build/block-library/blocks/tag-cloud/style-rtl.css	221 B	0 B
build/block-library/blocks/tag-cloud/style.css	221 B	0 B
build/block-library/blocks/template-part/editor-rtl.css	714 B	0 B
build/block-library/blocks/template-part/editor.css	714 B	0 B
build/block-library/blocks/text-columns/editor-rtl.css	220 B	0 B
build/block-library/blocks/text-columns/editor.css	220 B	0 B
build/block-library/blocks/text-columns/style-rtl.css	283 B	0 B
build/block-library/blocks/text-columns/style.css	283 B	0 B
build/block-library/blocks/verse/editor-rtl.css	194 B	0 B
build/block-library/blocks/verse/editor.css	194 B	0 B
build/block-library/blocks/verse/style-rtl.css	215 B	0 B
build/block-library/blocks/verse/style.css	215 B	0 B
build/block-library/blocks/video/editor-rtl.css	617 B	0 B
build/block-library/blocks/video/editor.css	617 B	0 B
build/block-library/blocks/video/style-rtl.css	303 B	0 B
build/block-library/blocks/video/style.css	304 B	0 B
build/block-library/common-rtl.css	1.01 kB	0 B
build/block-library/common.css	1.01 kB	0 B
build/block-library/editor-rtl.css	8.96 kB	0 B
build/block-library/editor.css	8.96 kB	0 B
build/block-library/index.js	142 kB	0 B
build/block-library/style-rtl.css	8.52 kB	0 B
build/block-library/style.css	8.53 kB	0 B
build/block-library/theme-rtl.css	860 B	0 B
build/block-library/theme.css	860 B	0 B
build/block-serialization-default-parser/index.js	1.88 kB	0 B
build/block-serialization-spec-parser/index.js	3.06 kB	0 B
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build/compose/index.js	11.2 kB	0 B
build/core-data/index.js	15.2 kB	0 B
build/data-controls/index.js	829 B	0 B
build/data/index.js	8.97 kB	0 B
build/date/index.js	31.8 kB	0 B
build/deprecated/index.js	768 B	0 B
build/dom-ready/index.js	571 B	0 B
build/dom/index.js	4.95 kB	0 B
build/edit-navigation/index.js	11.1 kB	0 B
build/edit-navigation/style-rtl.css	938 B	0 B
build/edit-navigation/style.css	944 B	0 B
build/edit-post/index.js	306 kB	0 B
build/edit-post/style-rtl.css	6.56 kB	0 B
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build/edit-site/style-rtl.css	4 kB	0 B
build/edit-site/style.css	4 kB	0 B
build/edit-widgets/index.js	23.6 kB	0 B
build/edit-widgets/style-rtl.css	3.16 kB	0 B
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build/editor/style-rtl.css	3.89 kB	0 B
build/editor/style.css	3.89 kB	0 B
build/element/index.js	4.62 kB	0 B
build/escape-html/index.js	735 B	0 B
build/format-library/index.js	6.75 kB	0 B
build/format-library/style-rtl.css	620 B	0 B
build/format-library/style.css	621 B	0 B
build/hooks/index.js	2.27 kB	0 B
build/html-entities/index.js	623 B	0 B
build/i18n/index.js	3.57 kB	0 B
build/is-shallow-equal/index.js	698 B	0 B
build/keyboard-shortcuts/index.js	2.54 kB	0 B
build/keycodes/index.js	1.94 kB	0 B
build/list-reusable-blocks/index.js	3.15 kB	0 B
build/list-reusable-blocks/style-rtl.css	629 B	0 B
build/list-reusable-blocks/style.css	628 B	0 B
build/media-utils/index.js	5.31 kB	0 B
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build/nux/style-rtl.css	731 B	0 B
build/nux/style.css	727 B	0 B
build/plugins/index.js	2.54 kB	0 B
build/primitives/index.js	1.43 kB	0 B
build/priority-queue/index.js	789 B	0 B
build/redux-routine/index.js	2.84 kB	0 B
build/reusable-blocks/index.js	2.91 kB	0 B
build/rich-text/index.js	13.5 kB	0 B
build/server-side-render/index.js	2.77 kB	0 B
build/shortcode/index.js	1.7 kB	0 B
build/token-list/index.js	1.27 kB	0 B
build/url/index.js	3.01 kB	0 B
build/viewport/index.js	1.85 kB	0 B
build/warning/index.js	1.14 kB	0 B
build/wordcount/index.js	1.22 kB	0 B

_{compressed-size-action}

[aristath]

Thank you @ellatrix for working on this!
Confirmed the fix in Firefox.
Code looks good and it was a simple fix, this is good to merge 👍

[ellatrix]

Great! Thanks!

[ockham]

Chery-picked to release/9.8.