ext-3307 - nearby chat stays scrolled at bottom

indra/llui/llfloater.cpp

indra/llui/lllayoutstack.cpp

indra/llui/llpanel.cpp

indra/llui/llradiogroup.cpp

indra/llui/llscrolllistcell.cpp

indra/llui/llspinctrl.cpp

indra/llui/lltabcontainer.cpp

indra/llui/lltextbase.cpp

indra/llui/lltextbase.h

indra/llui/llui.cpp

indra/llui/lluictrlfactory.h

indra/llui/lluiimage.cpp

indra/llui/llview.cpp

indra/llui/llview.h

indra/newview/llchathistory.cpp

indra/newview/llchathistory.h

indra/newview/skins/default/xui/en/floater_aaa.xml

indra/newview/skins/default/xui/en/strings.xml

indra/newview/skins/default/xui/en/widgets/chat_history.xml