refactor(decor): use decor levels properly

src/nvim/api/extmark.c

@@ -488,6 +488,7 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
   FUNC_API_SINCE(7)
 {
   Decoration decor = DECORATION_INIT;
+  bool has_decor = false;
 
   buf_T *buf = find_buffer_by_handle(buffer, err);
   if (!buf) {
@@ -577,6 +578,7 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
       if (ERROR_SET(err)) {
         goto error;
       }
+      has_decor = true;
     }
   }
 
@@ -586,6 +588,7 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
     if (c.size) {
       decor.conceal_char = utf_ptr2char((const char_u *)c.data);
     }
+    has_decor = true;
   } else if (HAS_KEY(opts->conceal)) {
     api_set_error(err, kErrorTypeValidation, "conceal is not a String");
     goto error;
@@ -594,6 +597,7 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
   if (opts->virt_text.type == kObjectTypeArray) {
     decor.virt_text = parse_virt_text(opts->virt_text.data.array, err,
                                       &decor.virt_text_width);
+    has_decor = true;
     if (ERROR_SET(err)) {
       goto error;
     }
@@ -665,6 +669,7 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
       if (ERROR_SET(err)) {
         goto error;
       }
+      has_decor = true;
     }
   } else if (HAS_KEY(opts->virt_lines)) {
     api_set_error(err, kErrorTypeValidation, "virt_lines is not an Array");
@@ -693,6 +698,7 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
       api_set_error(err, kErrorTypeValidation, "sign_text is not a valid value");
       goto error;
     }
+    has_decor = true;
   } else if (HAS_KEY(opts->sign_text)) {
     api_set_error(err, kErrorTypeValidation, "sign_text is not a String");
     goto error;
@@ -718,6 +724,9 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
   OPTION_TO_BOOL(ephemeral, ephemeral, false);
 
   OPTION_TO_BOOL(decor.ui_watched, ui_watched, false);
+  if (decor.ui_watched) {
+    has_decor = true;
+  }
 
   if (line < 0) {
     api_set_error(err, kErrorTypeValidation, "line value outside range");
@@ -780,7 +789,8 @@ Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer
     }
 
     extmark_set(buf, (uint32_t)ns_id, &id, (int)line, (colnr_T)col, line2, col2,
-                &decor, right_gravity, end_right_gravity, kExtmarkNoUndo);
+                has_decor ? &decor : NULL, right_gravity, end_right_gravity,
+                kExtmarkNoUndo);
   }
 
   return (Integer)id;

src/nvim/decoration.c

@@ -74,8 +74,7 @@ void decor_redraw(buf_T *buf, int row1, int row2, Decoration *decor)
     }
   }
 
-  if (decor && (kv_size(decor->virt_text)
+  if (decor && decor_virt_pos(*decor)) {
-                || decor->ui_watched)) {
     redraw_buf_line_later(buf, row1 + 1);
   }
 
@@ -175,6 +174,12 @@ Decoration get_decor(mtkey_t mark)
   }
 }
 
+/// @return true if decor has a virtual position (virtual text or ui_watched)
+static bool decor_virt_pos(Decoration decor)
+{
+  return kv_size(decor.virt_text) || decor.ui_watched;
+}
+
 
 bool decor_redraw_start(buf_T *buf, int top_row, DecorState *state)
 {
@@ -196,22 +201,11 @@ bool decor_redraw_start(buf_T *buf, int top_row, DecorState *state)
 
     Decoration decor = get_decor(mark);
 
-    // Exclude non-paired marks unless they contain virt_text or a sign
-    // or they are ui-watched
-    if (!mt_paired(mark)
-        && !kv_size(decor.virt_text)
-        && !decor_has_sign(&decor)
-        && !decor.ui_watched) {
-      goto next_mark;
-    }
-
     mtpos_t altpos = marktree_get_altpos(buf->b_marktree, mark, NULL);
 
     // Exclude start marks if the end mark position is above the top row
     // Exclude end marks if we have already added the start mark
-    if ((mt_start(mark) && altpos.row < top_row
+    if ((mt_start(mark) && altpos.row < top_row && !decor_virt_pos(decor))
-         && !kv_size(decor.virt_text)
-         && !decor.ui_watched)
         || (mt_end(mark) && altpos.row >= top_row)) {
       goto next_mark;
     }
@@ -301,13 +295,6 @@ int decor_redraw_col(buf_T *buf, int col, int win_col, bool hidden, DecorState *
       endpos = mark.pos;
     }
 
-    if (endpos.row < mark.pos.row
-        || (endpos.row == mark.pos.row && endpos.col <= mark.pos.col)) {
-      if (!kv_size(decor.virt_text) && !decor.ui_watched) {
-        goto next_mark;
-      }
-    }
-
     decor_add(state, mark.pos.row, mark.pos.col, endpos.row, endpos.col,
               &decor, false, mark.ns, mark.id);
 
@@ -326,8 +313,7 @@ next_mark:
     bool active = false, keep = true;
     if (item.end_row < state->row
         || (item.end_row == state->row && item.end_col <= col)) {
-      if (!(item.start_row >= state->row
+      if (!(item.start_row >= state->row && decor_virt_pos(item.decor))) {
-            && (kv_size(item.decor.virt_text) || item.decor.ui_watched))) {
         keep = false;
       }
     } else {
@@ -355,7 +341,7 @@ next_mark:
       }
     }
     if ((item.start_row == state->row && item.start_col <= col)
-        && (kv_size(item.decor.virt_text) || item.decor.ui_watched)
+        && decor_virt_pos(item.decor)
         && item.decor.virt_text_pos == kVTOverlay && item.win_col == -1) {
       item.win_col = (item.decor.virt_text_hide && hidden) ? -2 : win_col;
     }
@@ -523,8 +509,7 @@ bool decor_redraw_eol(buf_T *buf, DecorState *state, int *eol_attr, int eol_col)
   bool has_virttext = false;
   for (size_t i = 0; i < kv_size(state->active); i++) {
     DecorRange item = kv_A(state->active, i);
-    if (item.start_row == state->row
+    if (item.start_row == state->row && decor_virt_pos(item.decor)) {
-        && (kv_size(item.decor.virt_text) || item.decor.ui_watched)) {
       has_virttext = true;
     }
 

src/nvim/screen.c

@@ -1704,13 +1704,11 @@ static void win_update(win_T *wp, DecorProviders *providers)
   wp->w_old_botfill = wp->w_botfill;
 
   // Send win_extmarks if needed
-  if (kv_size(win_extmark_arr) > 0) {
   for (size_t n = 0; n < kv_size(win_extmark_arr); n++) {
     ui_call_win_extmark(wp->w_grid_alloc.handle, wp->handle,
                         kv_A(win_extmark_arr, n).ns_id, kv_A(win_extmark_arr, n).mark_id,
                         kv_A(win_extmark_arr, n).win_row, kv_A(win_extmark_arr, n).win_col);
   }
-  }
 
   if (dollar_vcol == -1) {
     /*