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mothra: respond to scroll wheel

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

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

@@ -398,6 +398,13 @@

 			break;

 		case Emouse:

 			mouse=e.mouse;

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

+				if(mouse.buttons & 8)

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

+				else

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

+				break;

+			}

 			plmouse(root, &mouse);

 			break;

 		case Eplumb:

-- 

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