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[PATCH 1/3] branch: only perform HEAD check for local branches

When assembling the ref-filter format to show "git branch"
output, we put the "%(if)%(HEAD)" conditional at the start
of the overall format. But there's no point in checking
whether a remote branch matches HEAD, as it never will.
The check should go inside the local conditional; we
assemble that format inside the "local" strbuf.

By itself, this is just a minor optimization. But in a
future patch, we'll need this refactoring to fix
local-branch coloring.

Signed-off-by: Jeff King <peff@xxxxxxxx>
 builtin/branch.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/builtin/branch.c b/builtin/branch.c
index c958e9325..a849373b7 100644
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -335,8 +335,9 @@ static char *build_format(struct ref_filter *filter, int maxwidth, const char *r
 	struct strbuf local = STRBUF_INIT;
 	struct strbuf remote = STRBUF_INIT;
-	strbuf_addf(&fmt, "%%(if)%%(HEAD)%%(then)* %s%%(else)  %%(end)",
+	strbuf_addf(&local, "%%(if)%%(HEAD)%%(then)* %s%%(else)  %%(end)",
+	strbuf_addf(&remote, "  ");
 	if (filter->verbose) {
 		struct strbuf obname = STRBUF_INIT;