Support hypergrid search url

indra/newview/app_settings/settings_alchemy.xml

@@ -706,6 +706,17 @@
       <key>Value</key>
       <string />
     </map>
+	<key>OpenSimSearchURL</key>
+	<map>
+      <key>Comment</key>
+      <string>OpenSim fallback search url</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>String</string>
+      <key>Value</key>
+      <string>http://search.metaverseink.com/opensim/results.jsp?query=[QUERY]&amp;submit=[CATEGORY]</string>
+	</map>
     <key>RenderAutoMaskAlphaUseRMSE</key>
     <map>
       <key>Comment</key>

indra/newview/llfloatersearch.cpp

@@ -38,6 +38,8 @@
 #include "llagent.h"
 #include "llui.h"
 #include "llviewercontrol.h"
+#include "llviewernetwork.h"
+#include "llviewerregion.h"
 #include "llweb.h"
 
 // support secondlife:///app/search/{CATEGORY}/{QUERY} SLapps
@@ -199,7 +201,9 @@ void LLFloaterSearch::search(const SearchQuery &p)
 
 	// get the search URL and expand all of the substitutions
 	// (also adds things like [LANGUAGE], [VERSION], [OS], etc.)
-	std::string url = gSavedSettings.getString("SearchURL");
+	LLViewerRegion* regionp = gAgent.getRegion();
+	std::string url = regionp != nullptr ? regionp->getSearchServerURL()
+		: gSavedSettings.getString(LLGridManager::getInstance()->isInOpenSim() ? "OpenSimSearchURL" : "SearchURL") :
 	url = LLWeb::expandURLSubstitutions(url, subs);
 
 	// and load the URL in the web view