Fixed normal bug EXT-4743 ('Stop flying' button disappears if minimize undocked movement controls)

- synchronized visibility of "stand_stop_flying_container" with a panel visibility when it is reparented from the Move Floater to container.

--HG--
branch : product-engine

indra/newview/llmoveview.cpp

@@ -651,6 +651,9 @@ void LLPanelStandStopFlying::reparent(LLFloaterMove* move_view)
 		// Detach from movement controls. 
 		parent->removeChild(this);
 		mOriginalParent.get()->addChild(this);
+		// update parent with self visibility (it is changed in setVisible()). EXT-4743
+		mOriginalParent.get()->setVisible(getVisible());
+
 		mAttached = false;
 		updatePosition(); // don't defer until next draw() to avoid flicker
 	}