wp_theme_editor_filetypes filter can not remove php and css file types

[mxp]

I don't know why wp_get_theme_file_editable_extensions this method need to ensure that default types will still there.

Sometimes just won't let people modify php files or other file types to avoid an unexpected issue. (including plugin editor)

btw, this wp_get_plugin_file_editable_extensions method do not have that restrict.

Maybe it's a bug!?

[SergeyBiryukov]

Related: [35180] / #22924.