"current_theme_supports-{$feature}" filter doesn't run if no $args are passed

[helgatheviking]

If there are no args passed to current_theme_supports() then the function terminates early and you never reach the current_theme_supports-{$feature}

See:
​https://github.com/WordPress/wordpress-develop/blob/5.9/src/wp-includes/theme.php#L3041-L3043

[azouamauriac]

Hello there, thanks for the repport!

The return was introduced here [12350] while there wasn't filter yet, then the filter come here [19682].

This can be milestone for consideration I think.

[SergeyBiryukov]

Thanks for the ticket! Good catch, this seems like an oversight.

[pavanpatil1]

Created patch

[SergeyBiryukov]

In 52812:

Themes: Make sure the current_theme_supports-{$feature} filter is consistently applied.

Previously, the filter was not applied if there are no arguments passed to current_theme_supports().

Follow-up to [12350], [19682].

Props helgatheviking, azouamauriac, pavanpatil1, SergeyBiryukov.
Fixes #55219.