fix lsp diagnostics highligth: find_node index, bufnr (#295)

lua/nvim-tree/diagnostics.lua

@@ -14,7 +14,7 @@ local function get_severity(diagnostics)
 end
 
 local function highlight_node(node, linenr)
-  local buf = require'nvim-tree.lib'.Tree.bufnr
+  local buf = require'nvim-tree.view'.View.bufnr
   if not vim.fn.bufexists(buf) or not vim.fn.bufloaded(buf) then return end
   local line = a.nvim_buf_get_lines(buf, linenr, linenr+1, false)[1]
   local starts_at = vim.fn.stridx(line, node.name)

lua/nvim-tree/utils.lua

@@ -76,9 +76,10 @@ function M.find_node(nodes, fn)
       local n, idx = M.find_node(node.entries, fn)
       i = i + idx
       if n then return n, i end
-    end
+    else
       i = i + 1
     end
+  end
   return nil, i
 end