git-p4: fix handling of multi-word P4EDITOR
This teaches git-p4 to pass the P4EDITOR variable to the shell for expansion, so that any command-line arguments are correctly handled. Without this, git-p4 can only launch the editor if P4EDITOR is solely the path to the binary, without any arguments. This also adjusts t9805, which relied on the previous behaviour. Suggested-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NLuke Diamand <luke@diamand.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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