Enable output buffering in merge-recursive.
Buffering all message output until a merge invocation is complete is necessary to prevent intereferring with a progress meter that would indicate the number of files completely merged, and how many remain. This change does not introduce a progress meter, but merely lays the groundwork to buffer the output. To aid debugging output buffering is only enabled if verbosity is lower than 5. When using verbosity levels above 5 the user is probably debugging the merge program itself and does not want to see the output delayed, especially if they are stepping through portions of the code in a debugger. Signed-off-by: NShawn O. Pearce <spearce@spearce.org> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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