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mothra: <hr> drawing

<hr> is handled by drawing replicated bitmap across the with of
the page.

--- a/sys/src/cmd/mothra/libpanel/rtext.c

+++ b/sys/src/cmd/mothra/libpanel/rtext.c

@@ -88,7 +88,7 @@

 			if(tp->b){

 				a=tp->b->r.max.y-tp->b->r.min.y+BORD;

 				d=BORD;

-				w=tp->b->r.max.x-tp->b->r.min.x+BORD*2;

+				w=tp->b->repl?wid-x:tp->b->r.max.x-tp->b->r.min.x+BORD*2;

 			}

 			else if(tp->p){

 				/* what if plpack fails? */

@@ -134,7 +134,7 @@

 			if(t->b){

 				t->r.max.y=p.y+BORD;

 				t->r.min.y=p.y-(t->b->r.max.y-t->b->r.min.y)-BORD;

-				p.x+=(t->b->r.max.x-t->b->r.min.x)+BORD*2;

+				p.x+=t->b->repl?wid-p.x:(t->b->r.max.x-t->b->r.min.x)+BORD*2;

 			}

 			else if(t->p){

 				t->r.max.y=p.y;