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mothra: mouse scrollwheel behave the same as in sam

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

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

@@ -394,11 +394,11 @@

 			break;

 		case Emouse:

 			mouse=e.mouse;

-			if(mouse.buttons & (8|16)){

+			if(mouse.buttons & (8|16) && ptinrect(mouse.xy, text->r)){

 				if(mouse.buttons & 8)

-					scrolltext(-text->size.y/24, 1);

+					scrolltext(text->r.min.y - mouse.xy.y, 1);

 				else

-					scrolltext(text->size.y/24, 1);

+					scrolltext(mouse.xy.y - text->r.min.y, 1);

 				break;

 			}

 			plmouse(root, &mouse);