refactor: revert set_last_win_as_target default and move autocmd

- Changed the default value of `set_last_win_as_target` back to `false` to maintain original behavior.
- Moved the autocmd for `set_last_win_as_target` to `open-file.lua` for better organization.

doc/nvim-tree-lua.txt

@@ -570,7 +570,7 @@ Following is the default configuration. See |nvim-tree-opts| for details. >lua
       },
       actions = {
         use_system_clipboard = true,
-        set_last_win_as_target = true,
+        set_last_win_as_target = false,
         change_dir = {
           enable = true,
           global = false,
@@ -1441,7 +1441,7 @@ the target window for `nvim-tree`. When enabled, the last active window will be
 set as the target for file actions (like opening files), ensuring better window
 management. When disabled, the default behavior applies.
 
-  Type: `boolean`, Default: `true`
+  Type: `boolean`, Default: `false`
 
 *nvim-tree.actions.change_dir*
 vim |current-directory| behaviour.

lua/nvim-tree.lua

@@ -232,17 +232,6 @@ local function setup_autocommands(opts)
       end,
     })
   end
-
-  if opts.actions.set_last_win_as_target then
-    create_nvim_tree_autocmd("BufLeave", {
-      callback = function()
-        local buf_name = vim.api.nvim_buf_get_name(0)
-        if not string.find(buf_name, "NvimTree_") then
-          require("nvim-tree.lib").set_target_win()
-        end
-      end,
-    })
-  end
 end
 
 local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
@@ -440,7 +429,7 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
   },
   actions = {
     use_system_clipboard = true,
-    set_last_win_as_target = true,
+    set_last_win_as_target = false,
     change_dir = {
       enable = true,
       global = false,

lua/nvim-tree/actions/node/open-file.lua

@@ -426,6 +426,15 @@ function M.setup(opts)
     opts.actions.open_file.window_picker.chars = tostring(opts.actions.open_file.window_picker.chars):upper()
   end
   M.window_picker = opts.actions.open_file.window_picker
+  if opts.actions.set_last_win_as_target then
+    vim.api.nvim_create_autocmd("BufLeave", {
+      callback = function()
+        if utils.is_nvim_tree_buf then
+          lib.set_target_win()
+        end
+      end,
+    })
+  end
 end
 
 return M