Default link to image_default_link_type for gallery

[ajlende]

Description

Fixes #10173 for galleries

Related to #25578 which fixes it for images

• Remove block default linkTo value
• Use the image_default_link_type option from options.php to set default link for galleries
• Adjust linkTo attribute to match link values in PHP: 'media'→'file' and 'attachment'→'post'
• Fix shortcode 'post' link transformation (before 'post' wasn't getting transformed to 'attachment' in transforms.js, but now with the block using the same values as the shortcode it doesn't need to be transformed)
• Update deprecated.js with the attribute change
• Update transforms.js with the attribute change

How has this been tested?

New gallery block

1. Change the image_default_link_type setting in options.php to 'post', 'file', or 'none'
2. Create a gallery block
3. See that the Link to option is correct: Attachment page for 'post', Media file for 'file' or None for 'none'

Migrate gallery block

1. Create gallery block off of master branch with various link options
2. Switch to this branch
3. See that old gallery block is updated with the new attributes

Transform from shortcode

1. Create a Classic Editor block
2. Add gallery in the Classic Editor
3. Click 'Convert to blocks'
4. See that the link option in the shortcode goes to the linkTo option in the gallery

Screenshots

Types of changes

New feature? Bug fix?

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: +211 B (0%)

Total Size: 1.17 MB

Filename	Size	Change
build/block-editor/index.js	128 kB	-8 B (0%)
build/block-library/index.js	135 kB	+219 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
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build/annotations/index.js	3.52 kB	0 B
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build/blob/index.js	620 B	0 B
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build/block-directory/style-rtl.css	943 B	0 B
build/block-directory/style.css	942 B	0 B
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build/dom/index.js	4.42 kB	0 B
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build/edit-navigation/style-rtl.css	868 B	0 B
build/edit-navigation/style.css	871 B	0 B
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build/editor/style.css	3.8 kB	0 B
build/element/index.js	4.45 kB	0 B
build/escape-html/index.js	733 B	0 B
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build/format-library/style-rtl.css	547 B	0 B
build/format-library/style.css	548 B	0 B
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build/html-entities/index.js	621 B	0 B
build/i18n/index.js	3.55 kB	0 B
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build/keycodes/index.js	1.85 kB	0 B
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build/list-reusable-blocks/style-rtl.css	476 B	0 B
build/list-reusable-blocks/style.css	476 B	0 B
build/media-utils/index.js	5.12 kB	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
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build/priority-queue/index.js	789 B	0 B
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build/rich-text/index.js	13.7 kB	0 B
build/server-side-render/index.js	2.61 kB	0 B
build/shortcode/index.js	1.7 kB	0 B
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build/warning/index.js	1.13 kB	0 B
build/wordcount/index.js	1.17 kB	0 B

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[mkaz]

Looks good Alex, nice working with you on these! 👍

[nicolasbrouard]

Is this feature integrated in Wordpress 5.5.3?
Do I need to install the Gutenberg plugin?

[talldan]

@nicolasbrouard This won't be in WordPress 5.5.3, but it will be in the upcoming WordPress 5.6 due on 8th December (https://make.wordpress.org/core/5-6/).

[nicolasbrouard]

Awesome. Thanks a lot for the reply.

[cxlxin]

Please review: As of WP 5.9 the image_default_link_type option doesn't work for the new galleries. Images do still work.