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mergetool--lib: don't call "exit" in setup_tool
This will make it easier to use setup_tool in places where we expect that the selected tool will not support the current mode. We need to introduce a new return code for setup_tool to differentiate between the case of "the selected tool is invalid" and "the selected tool is not a built-in" since we must call setup_tool when a custom 'merge.<tool>.path' is configured for a built-in tool but avoid failing when the configured tool is not a built-in. Signed-off-by: John Keeping <john@keeping.me.uk> Signed-off-by: David Aguilar <davvid@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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