feat: reset old window when leaving the tree

lua/nvim-tree.lua

@@ -194,6 +194,20 @@ function M.reset_highlight()
   renderer.render_hl(view.View.bufnr)
 end
 
+local old_win = nil
+
+function M.save_previous_buf()
+  vim.cmd "wincmd p"
+  old_win = api.nvim_get_current_win()
+  vim.cmd "wincmd p"
+end
+
+function M.set_previous_buf()
+  if old_win then
+    api.nvim_set_current_win(old_win)
+  end
+end
+
 view.setup()
 colors.setup()
 vim.defer_fn(M.on_enter, 1)

plugin/tree.vim

@@ -17,6 +17,8 @@ augroup NvimTree
     au User LspDiagnosticsChanged lua require'nvim-tree.diagnostics'.update()
   endif
   au BufEnter * lua require'nvim-tree'.buf_enter()
+  au BufEnter NvimTree lua require'nvim-tree'.save_previous_buf()
+  au BufLeave NvimTree lua require'nvim-tree'.set_previous_buf()
   if get(g:, 'nvim_tree_auto_close') == 1
     au WinClosed * lua require'nvim-tree'.on_leave()
   endif