Prepend HTTP to Buttons block links when missing protocol

[getdave]

What?

Prepends http:// to links created using the button block which don't provide a protocol.

Closes https://github.com/WordPress/gutenberg/issues/46385

Why?

Because it provides a better UX.

How?

prependUrl() from @wordpress/url.

Testing Instructions

• Create a Page
• Add a Buttons Block
• Type a link without http:// or https://
• Publish the Page
• Click the button on the published Page

Testing Instructions for Keyboard

Screenshots or screencast

[github-actions[bot]]

Size Change: +21 B (0%)

Total Size: 1.31 MB

Filename	Size	Change
build/block-library/index.min.js	199 kB	+11 B (0%)
build/components/index.min.js	204 kB	+12 B (0%)
build/data/index.min.js	8.09 kB	-2 B (0%)

ℹ️ View Unchanged

Filename	Size
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build/annotations/index.min.js	2.78 kB
build/api-fetch/index.min.js	2.27 kB
build/autop/index.min.js	2.15 kB
build/blob/index.min.js	483 B
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build/block-directory/style-rtl.css	1.04 kB
build/block-directory/style.css	1.04 kB
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build/block-editor/default-editor-styles.css	403 B
build/block-editor/index.min.js	192 kB
build/block-editor/style-rtl.css	14.4 kB
build/block-editor/style.css	14.4 kB
build/block-library/blocks/archives/editor-rtl.css	61 B
build/block-library/blocks/archives/editor.css	60 B
build/block-library/blocks/archives/style-rtl.css	90 B
build/block-library/blocks/archives/style.css	90 B
build/block-library/blocks/audio/editor-rtl.css	150 B
build/block-library/blocks/audio/editor.css	150 B
build/block-library/blocks/audio/style-rtl.css	122 B
build/block-library/blocks/audio/style.css	122 B
build/block-library/blocks/audio/theme-rtl.css	138 B
build/block-library/blocks/audio/theme.css	138 B
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build/block-library/blocks/avatar/editor.css	116 B
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build/block-library/blocks/avatar/style.css	91 B
build/block-library/blocks/block/editor-rtl.css	305 B
build/block-library/blocks/block/editor.css	305 B
build/block-library/blocks/button/editor-rtl.css	485 B
build/block-library/blocks/button/editor.css	485 B
build/block-library/blocks/button/style-rtl.css	532 B
build/block-library/blocks/button/style.css	532 B
build/block-library/blocks/buttons/editor-rtl.css	337 B
build/block-library/blocks/buttons/editor.css	337 B
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build/block-library/blocks/code/theme.css	124 B
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_{compressed-size-action}

[github-actions[bot]]

Flaky tests detected in d70db6a04735b87b94f7aafb0dc2da4d76bd2ba7. Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4116781516 📝 Reported issues:

• #47632 in specs/editor/blocks/query.test.js
• #39763 in specs/editor/various/multi-block-selection.test.js

[getdave]

@scruffian I added an e2e test

[skorasaurus]

this would also close https://github.com/WordPress/gutenberg/issues/6841

[skorasaurus]

tested with several links; worked as expected.

I also created buttons with several other protocols (git, mailto, tel, doi, and http was not prepended to them; those links still worked as expected.

(note that this issue also affects image blocks - up to you whether that should be a separate PR