feat(highlight): implement CurSearch highlight

Adds a `CurSearch` highlight group to highlight the current search result under the cursor.

1 files changed, 10 insertions, 6 deletions

diff --git a/src/nvim/move.c b/src/nvim/move.c
index eda3298101..c55a9a296b 100644
--- a/src/nvim/move.c
+++ b/src/nvim/move.c
@@ -95,27 +95,31 @@ static void comp_botline(win_T *wp)
   win_check_anchored_floats(wp);
 }
 
-/// Redraw when w_cline_row changes and 'relativenumber' or 'cursorline' is set.
+/// Redraw when w_cline_row changes and 'relativenumber' or 'cursorline' is set
+/// or if the 'CurSearch' highlight is defined.
 /// Also when concealing is on and 'concealcursor' is not active.
 void redraw_for_cursorline(win_T *wp)
   FUNC_ATTR_NONNULL_ALL
 {
   if ((wp->w_valid & VALID_CROW) == 0 && !pum_visible()
-      && (wp->w_p_rnu || win_cursorline_standout(wp))) {
-    // win_line() will redraw the number column and cursorline only.
+      && (wp->w_p_rnu || win_cursorline_standout(wp)
+          || HL_ATTR(HLF_LC) || wp->w_hl_ids[HLF_LC])) {
+    // win_line() will redraw the number column and cursorline only
+    // and also update the CurSearch highlight (if needed).
     redraw_later(wp, VALID);
   }
 }
 
 /// Redraw when w_virtcol changes and 'cursorcolumn' is set or 'cursorlineopt'
-/// contains "screenline".
+/// contains "screenline" or when the 'CurSearch' highlight is defined.
 /// Also when concealing is on and 'concealcursor' is active.
 static void redraw_for_cursorcolumn(win_T *wp)
   FUNC_ATTR_NONNULL_ALL
 {
   if ((wp->w_valid & VALID_VIRTCOL) == 0 && !pum_visible()) {
-    if (wp->w_p_cuc) {
-      // When 'cursorcolumn' is set need to redraw with SOME_VALID.
+    if (wp->w_p_cuc || HL_ATTR(HLF_LC) || wp->w_hl_ids[HLF_LC]) {
+      // When 'cursorcolumn' is set or 'CurSearch' is defined
+      // need to redraw with SOME_VALID.
       redraw_later(wp, SOME_VALID);
     } else if (wp->w_p_cul && (wp->w_p_culopt_flags & CULOPT_SCRLINE)) {
       // When 'cursorlineopt' contains "screenline" need to redraw with VALID.