some fixes to highlight logic

src/hover.cpp

@@ -133,19 +133,19 @@ struct Sec_Hover_Fn {
       // if we're in display_grouped mode, we want to highlight the entire range of the section;
       u64 sec_len = cur_field_off - sec_start;
       info.rng = { start + sec_start, sec_len };
-      // In case of nested sections, only highlight the innermost
-      // FIXME: sometimes no section ends up highlighted!
-      if (innermost_section_highlighted <= cur_section_nesting) {
-        info.highlighted_desc = info.desc;
-      }
-      innermost_section_highlighted = max(cur_section_nesting, innermost_section_highlighted);
       // ended = true;
     }
 
-    --cur_section_nesting;
+    if (!info.highlighted_desc) {
+      info.highlighted_desc = hovered ? info.desc : prev_desc;
+      innermost_section_highlighted = max(cur_section_nesting, innermost_section_highlighted);
+    } else if (display_grouped && innermost_section_highlighted <= cur_section_nesting && hovered) {
+      info.highlighted_desc = info.desc;
+      innermost_section_highlighted = max(cur_section_nesting, innermost_section_highlighted);
+    }
 
+    --cur_section_nesting;
     info.desc = prev_desc;
-    return;
   }
 
   // returns true if `val_read` was read
@@ -824,6 +824,27 @@ Sec_Hover_Info get_section_hover_info(Arena *arena, Section section, u64 off, co
   default:;
   }
 
+  // If we're displaying individual values, only show the ancestry of the highlighted desc and its siblings.
+  // @Speed: there is probably a more efficient way to do this by construction.
+  if (info.highlighted_desc && !display_grouped) {
+    String8_Node *cur = info.highlighted_desc;
+    // keep the siblings of highlighted desc, but drop their children.
+    cur = cur->parent;
+    if (cur) {
+      for (String8_Node *child = cur->first_child; child; child = child->next) {
+        if (child != info.highlighted_desc)
+          child->first_child = child->last_child = nullptr;
+      }
+      while (cur->parent) {
+        // discard all other children
+        String8_Node *parent = cur->parent;
+        parent->first_child = parent->last_child = cur;
+        cur->next = nullptr;
+        cur = parent;
+      }
+    }
+  }
+
   return info;
 }
 

src/str.cpp

@@ -51,6 +51,7 @@ String8_Node *push_str8_node(Arena *arena, String8_Node *prev, const char *fmt,
   if (prev) {
     prev->next = snode;
     snode->head = prev->head;
+    snode->parent = prev->parent;
   } else {
     snode->head = snode;
   }
@@ -79,6 +80,7 @@ String8_Node *push_str8_node_child(Arena *arena, String8_Node *parent, const cha
     parent->last_child = parent->first_child = snode;
   }
   snode->head = parent->head;
+  snode->parent = parent;
 
   return snode;
 }

src/str.h

@@ -14,5 +14,6 @@ struct String8 {
 struct String8_Node {
   String8_Node *next, *prev, *head;
   String8_Node *first_child, *last_child;
+  String8_Node *parent;
   String8 str;
 };