patch 8.2.1999: terminal popup test sometimes fails

Problem:    Terminal popup test sometimes fails.
Solution:   Wait for the popup to close.
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index 846ec59..ee0e743 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -1249,8 +1249,8 @@
   " must not have switched to another window
   call assert_equal(winid, win_getid())
 
-  call feedkeys("exit\<CR>", 'xt')
-  sleep 50m
+  call StopShellInTerminal(termbuf)
+  call WaitFor({-> win_getid() != winid})
   exe 'bwipe! ' .. newbuf
 endfunc
 
diff --git a/src/version.c b/src/version.c
index 186bbde..ec1abe6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1999,
+/**/
     1998,
 /**/
     1997,