patch 8.2.3467: CursorHoldI event interferes with "CTRL-G U"

Problem:    CursorHoldI event interferes with "CTRL-G U". (Naohiro Ono)
Solution:   Restore the flag for "CTRL-G U" after triggering CursorHoldI.
            (closes #8937)
diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index f769eec..db1efba 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
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