QS med 3 (un)highlight of median etc fixed

Author: lee-naish

src/algorithms/controllers/quickSort_shared.js

@@ -380,7 +380,9 @@ export function run_QS(is_qs_median_of_3) {
           // assigning the pivot as the midpoint calculated above
           chunker_add_if(QS_BOOKMARKS.MEDIAN3_mid_to_middle_index, (vis, cur_mid, cur_left, cur_right) => {
             highlight(vis, cur_mid, false);
-            highlight(vis, cur_left, false);
+            // highlight seems to increment counter rather than set flag
+            if (cur_left !== cur_mid)
+              highlight(vis, cur_left, false);
             highlight(vis, cur_right, false);
           },
           [mid, left, right]); 
@@ -406,12 +408,14 @@ export function run_QS(is_qs_median_of_3) {
           swapAction(QS_BOOKMARKS.MEDIAN3_swap_A_idx_mid_with_A_idx_right_minus_1, mid, right-1);
 
           // pivot <- A[right - 1]
-          pivot_index = right-1
+          pivot_index = right-1;
           chunker_add_if(QS_BOOKMARKS.MEDIAN3_set_pivot_to_value_at_array_indx_right_minus_1, 
             (vis, cur_right, cur_left, cur_real_stack, cur_finished_stack_frames, cur_i, cur_j, cur_pivot_index, cur_depth) => {
             unhighlight(vis, cur_right, false);
             unhighlight(vis, cur_right -1, false);
-            unhighlight(vis, cur_left, false);
+            // unhighlight seems to decrement counter rather than unset flag
+            if (cur_left !== cur_right -1)
+              unhighlight(vis, cur_left, false);
 
             refresh_stack(vis, cur_real_stack, cur_finished_stack_frames, cur_i, cur_j, cur_pivot_index, cur_depth) // refresh stack to show pivot_index
           },