fix(diagnostics): do not show on file/dir with same prefix (#1832)

* fix diagnostics showing up on file/dir with same prefix

* using fnamemodify instead of gsub

Author: chomosuke

lua/nvim-tree/diagnostics.lua

@@ -108,13 +108,18 @@ function M.update()
     end
 
     for bufname, severity in pairs(buffer_severity) do
-      local bufpath = utils.canonical_path(bufname)
+      local bufpath = vim.fn.fnamemodify(utils.canonical_path(bufname), ":p")
       log.line("diagnostics", " bufpath '%s' severity %d", bufpath, severity)
       if 0 < severity and severity < 5 then
         for line, node in pairs(nodes_by_line) do
-          local nodepath = utils.canonical_path(node.absolute_path)
+          local nodepath = vim.fn.fnamemodify(utils.canonical_path(node.absolute_path), ":p")
           log.line("diagnostics", "  %d checking nodepath '%s'", line, nodepath)
-          if M.show_on_dirs and vim.startswith(bufpath, nodepath) and (not node.open or M.show_on_open_dirs) then
+          if
+            M.show_on_dirs
+            and node.nodes
+            and vim.startswith(bufpath, nodepath)
+            and (not node.open or M.show_on_open_dirs)
+          then
             log.line("diagnostics", " matched fold node '%s'", node.absolute_path)
             node.diag_status = severity
             add_sign(line, severity)