The highlight faces in mmm-default-submode-face block is invisible.
BTW, show-paren-match highlight is visible in mmm-default-submode-face instead; highlight faces of isearch either. But I don't know how were they implemented. Hope this info is useful.
[Annotation]
Face show-paren-match is used by Emacs built-in mode:
(show-paren-mode t)
(setq show-paren-style 'expression)
The highlight faces in
mmm-default-submode-face
block is invisible.BTW,
show-paren-match
highlight is visible inmmm-default-submode-face
instead; highlight faces ofisearch
either. But I don't know how were they implemented. Hope this info is useful.