open tree on package load instead of vimEnter

doc/nvim-tree-lua.txt

@@ -124,8 +124,8 @@ Default is 0
 
 |g:lua_tree_auto_open|				*g:lua_tree_auto_open*
 
-Can be `0` or `1`. When `1`, will bind |VimEnter| to automatically
-open tree on startup if no files are specified.
+Can be `0` or `1`. When `1`, will open the tree when the package is loaded.
+It's not relying on VimEnter anymore.
 Default is 0
 
 |g:lua_tree_auto_close|				*g:lua_tree_auto_close*

lua/tree.lua

@@ -196,4 +196,6 @@ function M.xdg_open()
   end))
 end
 
+M.on_enter()
+
 return M

plugin/tree.vim

@@ -14,7 +14,6 @@ augroup LuaTree
   if get(g:, 'lua_tree_auto_close') == 1
     au WinClosed * lua require'tree'.on_leave()
   endif
-  au VimEnter * lua require'tree'.on_enter()
   au ColorScheme * lua require'tree'.reset_highlight()
   au User FugitiveChanged lua require'tree'.refresh()
   if get(g:, 'lua_tree_tab_open') == 1