Template Part: Allow changing properties in focus mode

[Mamaduka]

What?

Resolves #37220.

PR updates the "Template Details" dropdown and enables changing the Template Part title and area.

The title edit field is only displayed for user-created parts while changing the area is available for any template part.

Why?

The user should be able to manage template properties while working in "focus mode."

How?

• I adjusted the canEditTitle condition to include template parts.
• Added a new component for displaying template part area options.

Testing Instructions

• Go to the Site Editor -> Template Parts
• Create a new template part.
• Confirm you can change the title and area.
• Switch to the theme provided part.
• Confirm that only the area selector is displayed.

Additional tests

Confirm that template part-related changes don't affect the details dropdown for the Templates.

Screenshots or screencast

Allows changing name	Doesn't allow changing name

[github-actions[bot]]

Size Change: +2.33 kB (0%)

Total Size: 1.27 MB

Filename	Size	Change
build/block-editor/index.min.js	156 kB	+88 B (0%)
build/block-library/blocks/group/editor-rtl.css	339 B	+6 B (+2%)
build/block-library/blocks/group/editor.css	339 B	+6 B (+2%)
build/block-library/editor-rtl.css	10.9 kB	+8 B (0%)
build/block-library/editor.css	10.9 kB	+7 B (0%)
build/block-library/index.min.js	185 kB	+1 B (0%)
build/blocks/index.min.js	49 kB	+1.7 kB (+4%)
build/components/index.min.js	231 kB	+259 B (0%)
build/components/style-rtl.css	14 kB	-40 B (0%)
build/components/style.css	14 kB	-36 B (0%)
build/core-data/index.min.js	15.4 kB	+137 B (+1%)
build/edit-site/index.min.js	57 kB	+220 B (0%)
build/edit-site/style-rtl.css	8.22 kB	-11 B (0%)
build/edit-site/style.css	8.21 kB	-11 B (0%)
build/editor/index.min.js	41.4 kB	-1 B (0%)

ℹ️ View Unchanged

Filename	Size
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build/annotations/index.min.js	2.76 kB
build/api-fetch/index.min.js	2.26 kB
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build/block-directory/style-rtl.css	990 B
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build/block-editor/default-editor-styles.css	378 B
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build/block-library/blocks/archives/editor.css	60 B
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build/block-library/blocks/archives/style.css	65 B
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build/block-library/blocks/audio/editor.css	150 B
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_{compressed-size-action}

[jameskoster]

Nice! Everything seems to be working :)

We can probably lose the helper text beneath the title input.

I think we should put these fields in the Inspector too, but we can do that separately since it should be aligned with regular templates. Perhaps we can tackle them together.

[Mamaduka]

We can probably lose the helper text beneath the title input.

Remove help text just for template parts or for both?

I think we should put these fields in the Inspector too, but we can do that separately since it should be aligned with regular templates. Perhaps we can tackle them together.

I agree it makes sense to implement this for both template types. Probably as a part of the TemplateCard component.

[jameskoster]

Remove help text just for template parts or for both?

Probably just Template Parts for now, the content doesn't make sense there.

I agree it makes sense to implement this for both template types. Probably as a part of the TemplateCard component.

I shared some potential designs over here: https://github.com/WordPress/gutenberg/issues/36951#issuecomment-1212213658

[Mamaduka]

Probably just Template Parts for now, the content doesn't make sense there.

Added condition to hide the help text for template parts 👍

[jameskoster]

Looking good. One final nitpick before this is good to go – can we add a full-width stroke beneath the title, to separate it from the area? It's a small cosmetic change that will move us closer to:

[Mamaduka]

I moved the template parts area selector into a separate group, so now the top border is displayed.