Updated fix for major bug EXT-6786 ('Stand' button is corrupted if movement...

Updated fix for major bug EXT-6786 ('Stand' button is corrupted if movement control floater is opened)

Added force hiding of Stand button to avoid seeing Stand & Move buttons at once for a short moment.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/233/

--HG--
branch : product-engine

indra/newview/llmoveview.cpp

@@ -697,6 +697,7 @@ void LLPanelStandStopFlying::onStandButtonClick()
 	gAgent.setControlFlags(AGENT_CONTROL_STAND_UP);
 
 	setFocus(FALSE); // EXT-482
+	mStandButton->setVisible(FALSE); // force visibility changing to avoid seeing Stand & Move buttons at once.
 }
 
 void LLPanelStandStopFlying::onStopFlyingButtonClick()