DEV-39188: clicking on unsupported secondlife:///app/ SLURLs now

brings up a notification telling you this; rather than displaying
the Place side panel with N/A information.

Now, if you click on an Event or Classified SLURL, you get this
unsupported alert (2.0 does not have side panels for these types
of assets, instead they are integrated into Search).

indra/newview/llurldispatcher.cpp

@@ -158,7 +158,8 @@ bool LLURLDispatcherImpl::dispatchApp(const std::string& url,
 									  LLMediaCtrl* web,
 									  bool trusted_browser)
 {
-	if (!LLSLURL::isSLURL(url))
+	// ensure the URL is in the secondlife:///app/ format
+	if (!LLSLURL::isSLURLCommand(url))
 	{
 		return false;
 	}
@@ -170,7 +171,14 @@ bool LLURLDispatcherImpl::dispatchApp(const std::string& url,
 	pathArray.erase(0); // erase "cmd"
 	bool handled = LLCommandDispatcher::dispatch(
 			cmd, pathArray, uri.queryMap(), web, trusted_browser);
-	return handled;
+
+	// alert if we didn't handle this secondlife:///app/ SLURL
+	// (but still return true because it is a valid app SLURL)
+	if (! handled)
+	{
+		LLNotifications::instance().add("UnsupportedCommandSLURL");
+	}
+	return true;
 }
 
 // static

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

@@ -6501,6 +6501,14 @@ Click Accept to join the chat or Decline to decline the invitation. Click Block
     The link you clicked cannot be opened from this web browser.
   </notification>
 
+  <notification
+   icon="notifytip.tga"
+   name="UnsupportedCommandSLURL"
+   priority="high"
+   type="notifytip">
+    The SLURL you clicked on is not supported.
+  </notification>
+
   <notification name="IMToast" type="notifytoast">
     [MESSAGE]
     <form name="form">