Revert "plugin.zsh: Finally always highlight, not only on non-error widgets!"

This reverts commit 6965d962c9.

fast-syntax-highlighting.plugin.zsh

@@ -91,7 +91,6 @@ _zsh_highlight()
           -fast-highlight-string-process "$PREBUFFER" "$BUFFER"
       }
       region_highlight=( $reply )
-      FAST_HIGHLIGHT[region_highlight_cache]="${(j: :)${(q)region_highlight[@]}}"
   else
       local char="${BUFFER[CURSOR+1]}"
       if [[ "$char" = ["{([])}"] || "${FAST_HIGHLIGHT[prev_char]}" = ["{([])}"] ]]; then
@@ -101,29 +100,6 @@ _zsh_highlight()
               -fast-highlight-string-process "$PREBUFFER" "$BUFFER"
               region_highlight=( $reply )
           }
-          FAST_HIGHLIGHT[region_highlight_cache]="${(j: :)${(q)region_highlight[@]}}"
-      fi
-
-      local -a rh_cache_copy
-      rh_cache_copy=( "${(@z)FAST_HIGHLIGHT[region_highlight_cache]}" )
-      integer rhcount=${#region_highlight} \
-              chcount=${#rh_cache_copy}
-      # If there are more than 2 entries of difference
-      # - to ignore the change done by zsh-autosuggestions
-      if (( rhcount - chcount > 2 ))
-      then
-          region_highlight=( "${(Q)rh_cache_copy[@]}" )
-
-      # If there is no difference in the # of entries, but...
-      # (again, to skip the +1 change applied by zsh-autosuggestions)
-      elif (( rhcount == chcount ))
-      then
-          # ... the contents is different
-          if [[ ${FAST_HIGHLIGHT[region_highlight_cache]} != \
-                ${(j: :)${(q)region_highlight[@]}} ]]
-          then
-              region_highlight=( "${(Q)rh_cache_copy[@]}" )
-          fi
       fi
   fi