scroll fix

Former-commit-id: 8cb82571c2bf5d47009de2114c22ad2107a1474f [formerly 8cb82571c2bf5d47009de2114c22ad2107a1474f [formerly 167a9a5c0c7ab8e04405862c7e26579e85a6ff9b [formerly 84371c348e]]]
Former-commit-id: 676187407e5b9d65a8cc3929d7952184f758cf7f
Former-commit-id: dee72aab0701966b55512c2852b6f92bd02ba56b [formerly c54f6a5cd6e198afc6880e9b01a1ffbf2f4f26da]
Former-commit-id: 9a9da254b19b371ebcff318f51168bb80a8150d7

cointop/navigation.go

@@ -77,7 +77,11 @@ func (ct *Cointop) pageUp(g *gocui.Gui, v *gocui.View) error {
 	_, sy := ct.tableview.Size()
 	rows := sy
 	if err := ct.tableview.SetCursor(cx, cy-rows); err != nil && oy > 0 {
-		if err := ct.tableview.SetOrigin(ox, oy-rows); err != nil {
+		k := oy - rows
+		if k < 0 {
+			k = 0
+		}
+		if err := ct.tableview.SetOrigin(ox, k); err != nil {
 			return err
 		}
 	}