Merge branch 'nd/graph-width-padded'

"log --graph --format=" learned that "%>|(N)" specifies the width
relative to the terminal's left edge, not relative to the area to
draw text that is to the right of the ancestry-graph section.  It
also now accepts negative N that means the column limit is relative
to the right border.

* nd/graph-width-padded:
  pretty.c: support <direction>|(<negative number>) forms
  pretty: pass graph width to pretty formatting for use in '%>|(N)'

commit.h

@@ -167,6 +167,7 @@ struct pretty_print_context {
 	 * should not be counted on by callers.
 	 */
 	struct string_list in_body_headers;
+	int graph_width;
 };
 
 struct userformat_want {