Wait for git diff to finish in git difftool
In ActivetState Perl, exec does not wait for the started program. This breaks difftool tests and may cause unexpected behaviour: git difftool has returned, but the rest of code (diff and possibly the interactive program are still running in the background. Acked-by: NDavid Aguilar <davvid@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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