Expand theme support removal for 3.0 features
|Reported by:||nacin||Owned by:|
We need remove_editor_style(), remove_custom_header_image(), and remove_custom_background().
These should internally remove theme support. I suppose the blacklist in that function needs to go.
Alternatively, we can simply add a switch statement in remove_theme_support() and handle the special instances there, but then that introduces an inconsistency, as add_theme_support() is used only internally there.
Also consider aligning the implementation of this with #14837.