vim-patch:8.2.0382: some tests fail when run under valgrind (#21936)

Problem:    Some tests fail when run under valgrind.
Solution:   Increase timeouts.

353c351bd2

Cherry-pick Test_pum_with_preview_win() from patch 8.2.0011.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/popupmenu.c

@@ -824,7 +824,7 @@ static bool pum_set_selected(int n, int repeat)
             // When the preview window was resized we need to
             // update the view on the buffer.  Only go back to
             // the window when needed, otherwise it will always be
-            // redraw.
+            // redrawn.
             if (resized) {
               no_u_sync++;
               win_enter(curwin_save, true);