#1216 show diagnostic signs on all folders (#1244)

lua/nvim-tree/utils.lua

@@ -123,6 +123,29 @@ function M.find_node(nodes, fn)
   return node, i
 end
 
+-- return visible nodes indexed by line
+-- @param nodes_all list of node
+-- @param line_start first index
+---@return table
+function M.get_nodes_by_line(nodes_all, line_start)
+  local nodes_by_line = {}
+  local line = line_start
+  local function iter(nodes)
+    for _, node in ipairs(nodes) do
+      nodes_by_line[line] = node
+      line = line + 1
+      if node.open == true then
+        local child = iter(node.nodes)
+        if child ~= nil then
+          return child
+        end
+      end
+    end
+  end
+  iter(nodes_all)
+  return nodes_by_line
+end
+
 ---Matching executable files in Windows.
 ---@param ext string
 ---@return boolean