fix: Incorporate nesting depth in hover highlight

lua/symbols-outline/parser.lua

@@ -253,6 +253,8 @@ function M.get_lines(flattened_outline_items)
     local hl_end = #string_prefix + #node.icon
     local hl_type = config.options.symbols[symbols.kinds[node.kind]].hl
     table.insert(hl_info, { node_line, hl_start, hl_end, hl_type })
+
+    node.prefix_length = #string_prefix + #node.icon + 1
   end
   return lines, hl_info
 end

lua/symbols-outline/writer.lua

@@ -74,11 +74,13 @@ M.add_hover_highlights = function(bufnr, nodes)
     end
 
     local marker_fac = (config.options.fold_markers and 1) or 0
+    if node.prefix_length then
       ui.add_hover_highlight(
         bufnr,
         node.line_in_outline - 1,
-      (node.depth + marker_fac) * 2
+        node.prefix_length
       )
+    end
     ::continue::
   end
 end