fix(#1836): add view.debounce_delay (#1871)

* fix(#1836):add view.debounce_delay to avoid some unnecessary explorer reloads

* fixed BufReadPost & BufUnload nil pointer

* update_focused_file.debouce_delay to view.debounce_delay

* changed docs to be more accurate

* added debounce on modified update

* Using same event for filter buffer

* removed unused View.debounce_delay

* changed docs to be more accurate

Co-authored-by: doot <gugegby@gmail.com>
Co-authored-by: Alexander Courtis <alex@courtis.org>

doc/nvim-tree-lua.txt

@@ -192,6 +192,7 @@ Subsequent calls to setup will replace the previous configuration.
         adaptive_size = false,
         centralize_selection = false,
         cursorline = true,
+        debounce_delay = 15,
         width = 30,
         hide_root_folder = false,
         side = "left",
@@ -286,7 +287,6 @@ Subsequent calls to setup will replace the previous configuration.
       },
       update_focused_file = {
         enable = false,
-        debounce_delay = 15,
         update_root = false,
         ignore_list = {},
       },
@@ -520,11 +520,6 @@ until it finds the file.
     Enable this feature.
       Type: `boolean`, Default: `false`
 
-    *nvim-tree.update_focused_file.debounce_delay*
-    Idle milliseconds between BufEnter and update.
-    The last BufEnter will be focused, others are discarded.
-      Type: `number`, Default: `15` (ms)
-
     *nvim-tree.update_focused_file.update_root*  (previously `update_focused_file.update_cwd`)
     Update the root directory of the tree if the file is not under current
     root directory. It prefers vim's cwd and `root_dirs`.
@@ -716,6 +711,11 @@ Window / buffer setup.
     Enable |cursorline| in the tree window.
       Type: `boolean`, Default: `true`
 
+    *nvim-tree.view.debounce_delay*
+    Idle milliseconds before some reload / refresh operations.
+    Increase if you experience performance issues around screen refresh.
+      Type: `number`, Default: `15` (ms)
+
     *nvim-tree.view.hide_root_folder*
     Hide the path of the current working directory on top of the tree.
       Type: `boolean`, Default: `false`