Twenty Fifteen: Button border issue

[umesh84]

Twenty Fifteen Themes Gutenberg editor button border bottom is not working.

[umesh84]

added patch

[mukesh27]

#55003 was marked as a duplicate.

[sabernhardt]

This is related to the :where() selector, which also affected Twenty Twenty (#55824).

Additional change in editor-blocks.css:
As a follow-up to r44381, 55006.1.patch​ also corrects .is-style-outline .wp-block-button__link:not(.has-text-color), to match blocks.css.

[sabernhardt]

removing the editor stylesheet change

[sabernhardt]

I removed the extra edit. I had noticed a problem with Gutenberg activated, but the plugin may have fixed that already with inline styles. (And if it's not fixed, we can revisit that later for other themes, too.)

[audrasjb]

Before patch

[audrasjb]

After patch

[audrasjb]

I tested the patch and it looks good to me (see above screenshots).

Self-assigning for commit.

[audrasjb]

In 54151:

Twenty Fifteen: Ensure border-bottom styles are applied to the Button Block.

This issue was related to the :where() selector, which also affected Twenty Twenty (see #55824).

Props umesh84, sabernhardt.
Fixes #55006.
See #55824.