refactor(#2826): move view to instanced window class (#3153)

* refactor(#2826): singleton View class, WIP

* refactor(#2826): singleton View class, WIP

* refactor(#2826): singleton View class, WIP

* refactor(#2826): singleton View class, WIP

* refactor(#2826): singleton View class, WIP

* refactor(#2826): singleton View class, WIP

* refactor(#2826): singleton View class, WIP

* refactor(#2826): singleton View class

* refactor(#2826): View is an Explorer member

* refactor(#2826): move autocmds to Explorer

* refactor(#2826): API uses Explorer's View

* refactor(#2826): move View into Explorer package

* refactor(#2826): retain necessary view globals

* refactor(#2826): move all winhl to appearance constants

* refactor(#2826): add lifecycle logging to all Explorer members

* refactor(#2826): fix bad cherry-pick

* refactor(#2826): better enumerate_options function

* refactor(#2826): add View.tab_line for debugging

* refactor(#2826): default lifecycle log off

* refactor(#2826): add experimental.multi_instance_debug, split globals out of view, move diagnostics to its own module

* refactor(#2826): instrument View:get_winnr

* refactor(#2826): instrument View:setup_tabpage

* refactor(#2826): instrument View:set_current_win, View:prevent_buffer_override

* refactor(#2826): instrument View:get_bufnr

* refactor(#2826): track member bufnr -> winid with global

* refactor(#2826): tidy experiment names and logs

* vim: nvim-tree: track bufnr via buffer-update channel

* vim: nvim-tree: more logging

* vim: nvim-tree: revert: track bufnr via buffer-update channel

* refactor(#2826): notify error on view winid and bufnr mismatches

* refactor(#2826): notify error on view winid and bufnr mismatches

* refactor(#2826): explorer init logging

doc/nvim-tree-lua.txt

@@ -638,6 +638,7 @@ Following is the default configuration. See |nvim-tree-opts| for details. >lua
         },
       },
       experimental = {
+        multi_instance = false,
       },
       log = {
         enable = false,
@@ -1514,11 +1515,6 @@ Configuration options for opening a file from nvim-tree.
     Resizes the tree when opening a file.
       Type: `boolean`, Default: `true`
 
-    *nvim-tree.experimental.actions.open_file.relative_path*
-    Buffers opened by nvim-tree will use with relative paths instead of
-    absolute.
-      Type: `boolean`, Default: `true`
-
     *nvim-tree.actions.open_file.window_picker*
     Window picker configuration.
 
@@ -3008,9 +3004,6 @@ Windows WSL and PowerShell
 - Executable file detection is disabled as this is non-performant and can
   freeze nvim
 - Some filesystem watcher error related to permissions will not be reported
-- Some users have reported unspecified issues with
-  |nvim-tree.experimental.actions.open_file.relative_path|. Please report any
-  issues or disable this feature.
 
 ==============================================================================
  13. NETRW                                                   *nvim-tree-netrw*
@@ -3145,7 +3138,6 @@ highlight group is not, hard linking as follows: >
 |nvim-tree.diagnostics.show_on_open_dirs|
 |nvim-tree.disable_netrw|
 |nvim-tree.experimental|
-|nvim-tree.experimental.actions.open_file.relative_path|
 |nvim-tree.filesystem_watchers.debounce_delay|
 |nvim-tree.filesystem_watchers.enable|
 |nvim-tree.filesystem_watchers.ignore_dirs|