revert(#3180, #3177): invalid group or tabpage (#3181)

* Revert "feat(#2826): allow only one window with nvim-tree buffer per tab (#3174)"

This reverts commit dd2364d680.

* Revert "refactor(#2826): View tracks winids and bufnrs via events, unused for now (#3170)"

This reverts commit 65bae44922.

* Revert "refactor(#2826): remove view debug/cc, enable new codepaths for get_winid and get_bufnr (#3169)"

This reverts commit a9156c0139.

doc/nvim-tree-lua.txt

@@ -639,6 +639,7 @@ Following is the default configuration. See |nvim-tree-opts| for details. >lua
         },
       },
       experimental = {
+        multi_instance = false,
       },
       log = {
         enable = false,