MOUSE_BUTTON7DOWN
extended_buttons |= MOUSE_BUTTON7DOWN;
else if (ms->button & MOUSE_BUTTON7DOWN)
MOUSE_BUTTON6DOWN | MOUSE_BUTTON7DOWN);
MOUSE_BUTTON6DOWN : MOUSE_BUTTON7DOWN;
MOUSE_BUTTON7DOWN : MOUSE_BUTTON6DOWN;
else if (ms->button & MOUSE_BUTTON7DOWN)
MOUSE_BUTTON6DOWN | MOUSE_BUTTON7DOWN);
MOUSE_BUTTON5DOWN, MOUSE_BUTTON6DOWN, MOUSE_BUTTON7DOWN, MOUSE_BUTTON8DOWN,
MOUSE_BUTTON7DOWN,