DEV-44136: Hide previous results when performing new search.

When a new search is performed, we first display a blank page in the
search floater so that the previous results are not visible while the
new results are being retrieved from the search server.

indra/newview/llfloatersearch.cpp

@@ -77,6 +77,15 @@ void LLFloaterSearch::onOpen(const LLSD& key)
 	search(key);
 }
 
+void LLFloaterSearch::onClose(bool app_quitting)
+{
+	if (! app_quitting)
+	{
+		// Show the blank home page ready for the next onOpen()
+		mBrowser->navigateHome();
+	}
+}
+
 void LLFloaterSearch::handleMediaEvent(LLPluginClassMedia *self, EMediaEvent event)
 {
 	switch (event) 
@@ -110,6 +119,11 @@ void LLFloaterSearch::search(const LLSD &key)
 		return;
 	}
 
+	// display the blank home page first, to clear the display of 
+	// any previous search results while the new results load.
+	// The home page is set in floater_search.xml as start_url.
+	mBrowser->navigateHome();
+
 	// reset the god level warning as we're sending the latest state
 	childHide("refresh_search");
 	mSearchGodLevel = gAgent.getGodLevel();

indra/newview/llfloatersearch.h

@@ -59,6 +59,8 @@ public:
 	/// see search() for details on the key parameter.
 	/*virtual*/ void onOpen(const LLSD& key);
 
+	/*virtual*/ void onClose(bool app_quitting);
+
 	/// perform a search with the specific search term.
 	/// The key should be a map that can contain the following keys:
 	///  - "id": specifies the text phrase to search for