fix(#1639): ensure tree autocommands match filetype as well as name (#1640)

* fix(#1629): nvim start with file named *NvimTree* opens tree instead of buffer

* Revert "fix(#1629): nvim start with file named *NvimTree* opens tree instead of buffer"

This reverts commit e7136078f7.

* fix(#1629): nvim start with file named *NvimTree* treats file as tree

* fix(#1629): nvim start with file named *NvimTree* treats file as tree

* fix(#1639): ensure tree autocommands match filetype as well as name

* fix(#1639): fix bad merge

* fix(#1639): ensure tree autocommands match filetype as well as name

lua/nvim-tree/utils.lua

@@ -468,13 +468,23 @@ function M.inject_node(f)
   end
 end
 
----Is the buffer a tree? Like /path/to/NvimTree_2 and not a readable file.
----@param bufnr number
+---Is the buffer named NvimTree_[0-9]+ a tree? filetype is "NvimTree" or not readable file.
+---This is cheap, as the readable test should only ever be needed when resuming a vim session.
+---@param bufnr number may be 0 or nil for current
 ---@return boolean
 function M.is_nvim_tree_buf(bufnr)
+  if bufnr == nil then
+    bufnr = 0
+  end
   if vim.fn.bufexists(bufnr) then
     local bufname = a.nvim_buf_get_name(bufnr)
-    return vim.fn.fnamemodify(bufname, ":t"):match "^NvimTree_[0-9]+$" and vim.fn.filereadable(bufname) == 0
+    if vim.fn.fnamemodify(bufname, ":t"):match "^NvimTree_[0-9]+$" then
+      if vim.bo[bufnr].filetype == "NvimTree" then
+        return true
+      elseif vim.fn.filereadable(bufname) == 0 then
+        return true
+      end
+    end
   end
   return false
 end