Update legacy theme styles to add responsiveness to featured image

[thelovekesh]

Summary

Fixes #7550

Checklist

• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).

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[westonruter]

Shouldn't this be plugin?

Suggested change

	define( 'WP_DEVELOPMENT_MODE', 'theme' );
	define( 'WP_DEVELOPMENT_MODE', 'plugin' );

[thelovekesh]

Yes, it should be. I am just testing a few scenarios with theme.

[thelovekesh]

@westonruter wp_theme_has_theme_json() now depends on wp_get_development_mode() which is theme and WP_RUN_CORE_TESTS constant but setting up WP_RUN_CORE_TESTS is breaking our multiple test cases so I think for now we have to keep WP_DEVELOPMENT_MODE as theme.

[westonruter]

Is the problem that wp_theme_has_theme_json() is sending back stale results? Does this reflect a problem with caching?

[thelovekesh]

Yes. In these tests, we are changing the theme to TT3 to test reader theme features from theme.json. After changing the theme wp_theme_has_theme_json() returns false as the previous theme was not a theme with theme.json which is a cached result AFAIK.

[westonruter]

I think this then reflects a bug in wp_theme_has_theme_json. In particular, it is not varying the cache by the theme. There needs to be another static variable in wp_theme_has_theme_json which captures the theme that was checked, or else to let $theme_has_support be a mapping of theme slug to boolean.

[thelovekesh]

Yeah makes sense. It should have some logic to revalidate the cache in case the theme is being changed.

[westonruter]

Core patch created: WordPress/wordpress-develop#4816

[westonruter]

Great work!