Fix for maint-3154 alt-zoom zooms way out

indra/newview/llagentcamera.cpp

@@ -913,6 +913,8 @@ void LLAgentCamera::cameraZoomIn(const F32 fraction)
 	F32 max_distance = llmin(mDrawDistance - DIST_FUDGE, 
 							 LLWorld::getInstance()->getRegionWidthInMeters() - DIST_FUDGE );
 
+    max_distance = llmin(max_distance, current_distance * 4.f); //Scaled max relative to current distance.  MAINT-3154
+
 	if (new_distance > max_distance)
 	{
 		new_distance = max_distance;