(work in progress) Update for LLAccordionCtrl arrange single expansion.

Found this issue while working on EXT-6564(Fix wearable editing panels) - Every single_expansion accordion is treated like "fit_parent" is set to "true" after changes made in 9805 : e6c5f3b23be1 (fix for EXT-5128 Groups accordions should all appear on-screen w/out scrolling (open accordion should fill space)).
Updated accordion to take into account "fit_parent" property.

Reviewed by Vadim Savchuk - https://codereview.productengine.com/secondlife/r/147/

--HG--
branch : product-engine

indra/llui/llaccordionctrl.cpp

@@ -371,12 +371,34 @@ void	LLAccordionCtrl::arrangeSinge()
 			panel_height = accordion_tab->getRect().getHeight();
 		}
 		else
+		{
+			if(mFitParent)
 			{
 				panel_height = expanded_height;
 			}
+			else
+			{
+				if(accordion_tab->getAccordionView())
+				{
+					panel_height = accordion_tab->getAccordionView()->getRect().getHeight() + 
+						accordion_tab->getHeaderHeight() + 2*BORDER_MARGIN;
+				}
+				else
+				{
+					panel_height = accordion_tab->getRect().getHeight();
+				}
+			}
+		}
+
+		// make sure at least header is shown
+		panel_height = llmax(panel_height, accordion_tab->getHeaderHeight());
+
 		ctrlSetLeftTopAndSize(mAccordionTabs[i], panel_left, panel_top, panel_width, panel_height);
 		panel_top-=mAccordionTabs[i]->getRect().getHeight();
 	}
+
+	show_hide_scrollbar(getRect().getWidth(), getRect().getHeight());
+	updateLayout(getRect().getWidth(), getRect().getHeight());
 }
 
 void	LLAccordionCtrl::arrangeMultiple()

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

@@ -98,6 +98,7 @@ background_visible="true"
      left="0"
      top="0"
      single_expansion="true"
+     fit_parent="true"
      follows="all"
      layout="topleft"
      name="groups_accordion">