Use the right function to find out whether the theme is a block theme or not

[imath]

Just after releasing 10.5.0, some users reported the Kadence theme or Elementor were not able to load the BuddyPress pages.

It looks like it's possible for a theme to add support for 'block-templates' while it is not a Block templates only theme. This is why [13331] introduced (at least) template loading issues for the Kadence theme.

Exploring a bit more how WordPress adds the Appearance > Editor menu, it looks like the right function to use to be sure a Block based theme is active is: ​wp_is_block_theme().

Instead of checking whether a theme is supporting block-templates to find out whether the current theme is a Block (templates) based theme, use the wp_is_block_theme()

Trac ticket: ​https://buddypress.trac.wordpress.org/ticket/8757

[imath]

Just tested the patch with WordPress 5.8 to be 💯 sure. Everything's fine.

[imath]

In 13350:

Use the right function to check if active theme is a Block Based theme

[13331] introduced template loading issues for themes supporting block-templates without being Block Based themes.

See #8474
See #8757 (trunk)

[imath]

In 13351:

Use the right function to check if active theme is a Block Based theme

[13331] introduced template loading issues for themes supporting block-templates without being Block Based themes.

See #8474
Fixes #8757 (branch 10.0)

This was fixed in ​https://github.com/buddypress/buddypress/commit/39bcd35cf0af2ecc9c0253a0ac3249427e8529c3