Compose tips page doesn't render [font] or [color] examples.

This issue appears to have already existed in 9.4.8.

Correction, the issue has always existed when returning Filter::tips() as a string instead of Markup. This was introduced by #3207134: Add strict types to xbbcode → , which in a twist of dramatic irony does mention "methods which can return strings or MarkupInterface" as a potential obstacle, but fails to recognize that Filter::tips() is such a method.

Due to PHP silently casting the return value to string in methods that are hinted as string (instead of triggering a type error), this was not previously discovered.

Pushing a test-only patch. This should fail.

Pushing the fix. This should pass.

This probably needs to be backported to 4.0.x, because the strict return types were in there as well.

Automatically closed - issue fixed for 2 weeks with no activity.