Previously we were using a bespoke hodgepodge of
`Action::is_action_legacy()` and `Action::is_action_layered()`,
sometimes in combination with checking for the Baklava feature flag,
when what we really meant is "Should this action be treated as legacy
or not?"
This commit changes the places where that's semantically what we meant
to use `action_treat_as_legacy()`. Some of those places were already
correct, using a compound conditional, but some of them weren't, and
thus were not always branching correctly. For those latter cases,
this commit is a bug fix.
Importantly, not all uses of bare `Action::is_action_legacy()` or
`Action::is_action_layered()` are semantically incorrect: there are many
places where that is the right thing to do. This commit takes care not
to touch those places.
Pull Request: https://projects.blender.org/blender/blender/pulls/128174
124bae5a4d