Called after the style is changed for a given range (and after the display is refreshed; use on-change-style and begin-edit-sequence to avoid extra refreshes when after-change-style modifies the editor).
See also can-change-style? and on-edit-sequence.
No internals locks are set when this method is called.
This calls end-edit-sequence and updates the parenthesis hightlight. See highlight-parens.