'main': Support multiple styles in _zsh_highlight_main_add_region_highlight

highlighters/main/main-highlighter.zsh

@@ -68,7 +68,7 @@ _zsh_highlight_main_highlighter_predicate()
 # Helper to deal with tokens crossing line boundaries.
 _zsh_highlight_main_add_region_highlight() {
   integer start=$1 end=$2
-  local style=$3
+  shift 2
 
   # The calculation was relative to $PREBUFFER$BUFFER, but region_highlight is
   # relative to $BUFFER.
@@ -77,7 +77,7 @@ _zsh_highlight_main_add_region_highlight() {
 
   (( end < 0 )) && return # having end<0 would be a bug
   (( start < 0 )) && start=0 # having start<0 is normal with e.g. multiline strings
-  _zsh_highlight_add_highlight $start $end $style
+  _zsh_highlight_add_highlight $start $end "$@"
 }
 
 # Wrapper around 'type -w'.