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git: use commit date as traversal hint instead of author date

Although git9 always uses the same commit date and author date, other
implementation do make a distinction.  Since commit date is more
representative of the commit graph order, use this as a traversal hint
instead of author date.

--- a/sys/src/cmd/git/git.h

+++ b/sys/src/cmd/git/git.h

@@ -158,7 +158,7 @@

 struct Qelt {

 	Object	*o;

-	vlong	mtime;

+	vlong	ctime;

 	int	color;

 };

--- a/sys/src/cmd/git/util.c

+++ b/sys/src/cmd/git/util.c

@@ -349,9 +349,9 @@

 	}

 	q->heap[q->nheap].o = o;

 	q->heap[q->nheap].color = color;

-	q->heap[q->nheap].mtime = o->commit->mtime;

+	q->heap[q->nheap].ctime = o->commit->ctime;

 	for(i = q->nheap; i > 0; i = (i-1)/2){

-		if(q->heap[i].mtime < q->heap[(i-1)/2].mtime)

+		if(q->heap[i].ctime < q->heap[(i-1)/2].ctime)

 			break;

 		t = q->heap[i];

 		q->heap[i] = q->heap[(i-1)/2];

@@ -378,9 +378,9 @@

 		m = i;

 		l = 2*i+1;

 		r = 2*i+2;

-		if(l < q->nheap && q->heap[m].mtime < q->heap[l].mtime)

+		if(l < q->nheap && q->heap[m].ctime < q->heap[l].ctime)

 			m = l;

-		if(r < q->nheap && q->heap[m].mtime < q->heap[r].mtime)

+		if(r < q->nheap && q->heap[m].ctime < q->heap[r].ctime)

 			m = r;

 		if(m == i)

 			break;