EXT-4197: Search in sub-panels for help IDs too.

In order to support unique help IDs for the Landmark and Place Profile
panels off the Places sidetray, we need to also search within any
embedded (and visible) sub-panels.

indra/llui/llpanel.cpp

@@ -898,6 +898,44 @@ LLPanel *LLPanel::childGetVisibleTabWithHelp()
 	return ::childGetVisibleTabWithHelp(this);
 }
 
+static LLPanel *childGetVisiblePanelWithHelp(LLView *parent)
+{
+	LLView *child;
+
+	// look through immediate children first for an active panel with help
+	for (child = parent->getFirstChild(); child; child = parent->findNextSibling(child))
+	{
+		// do we have a panel with a help topic?
+		LLPanel *panel = dynamic_cast<LLPanel *>(child);
+		if (panel && panel->getVisible() && !panel->getHelpTopic().empty())
+		{
+			return panel;
+		}
+	}
+
+	// then try a bit harder and recurse through all children
+	for (child = parent->getFirstChild(); child; child = parent->findNextSibling(child))
+	{
+		if (child->getVisible())
+		{
+			LLPanel* panel = ::childGetVisiblePanelWithHelp(child);
+			if (panel)
+			{
+				return panel;
+			}
+		}
+	}
+
+	// couldn't find any active panels with a help topic string
+	return NULL;
+}
+
+LLPanel *LLPanel::childGetVisiblePanelWithHelp()
+{
+	// find a visible tab with a help topic (to determine help context)
+	return ::childGetVisiblePanelWithHelp(this);
+}
+
 void LLPanel::childSetPrevalidate(const std::string& id, BOOL (*func)(const LLWString &) )
 {
 	LLLineEditor* child = findChild<LLLineEditor>(id);

indra/llui/llpanel.h

@@ -214,7 +214,10 @@ public:
 	// LLTabContainer
 	void childShowTab(const std::string& id, const std::string& tabname, bool visible = true);
 	LLPanel *childGetVisibleTab(const std::string& id) const;
+
+	// Find a child with a nonempty Help topic 
 	LLPanel *childGetVisibleTabWithHelp();
+	LLPanel *childGetVisiblePanelWithHelp();
 
 	// LLTextBox/LLTextEditor/LLLineEditor
 	void childSetText(const std::string& id, const LLStringExplicit& text) { childSetValue(id, LLSD(text)); }

indra/llui/lluictrl.cpp

@@ -876,6 +876,14 @@ bool LLUICtrl::findHelpTopic(std::string& help_topic_out)
 				return true; // success (tab)
 			}
 
+			// does the panel have a sub-panel with a help topic?
+			LLPanel *subpanel = panel->childGetVisiblePanelWithHelp();
+			if (subpanel)
+			{
+				help_topic_out = subpanel->getHelpTopic();
+				return true; // success (subpanel)
+			}
+
 			// otherwise, does the panel have a help topic itself?
 			if (!panel->getHelpTopic().empty())
 			{

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

@@ -46,7 +46,7 @@ background_visible="true"
      height="533"
      layout="topleft"
      left="0"
-     help_topic="places_info_tab"
+     help_topic="place_profile"
      name="panel_place_profile"
      top="5"
      visible="false"
@@ -58,7 +58,7 @@ background_visible="true"
      height="533"
      layout="topleft"
      left="0"
-     help_topic="places_info_tab"
+     help_topic="landmark"
      name="panel_landmark_info"
      top="5"
      visible="false"
@@ -67,7 +67,6 @@ background_visible="true"
      height="19"
      layout="topleft"
      left="0"
-     help_topic="places_button_tab"
      name="button_panel"
      width="313">
         <button