fix for bug #3812

home button now goes to where ever the "browser.startup.homepage" pref is set.
(if it isn't set, we go to http://www.mozilla.org)
throbber goes to http://www.mozilla.org.  this value is set in navigator.xul.
previously, the throbber was hard wired to do what home did.
r=alecf
a=cyeh

dom/src/base/makefile.win

@@ -76,7 +76,7 @@ CPP_OBJS= \
 
 LINCS=-I$(XPDIST)\public\xpcom -I$(XPDIST)\public\raptor \
  -I$(XPDIST)\public\dom -I$(XPDIST)\public\js -I$(PUBLIC)\netlib -I$(PUBLIC)\plugin -I$(PUBLIC)\oji \
- -I$(PUBLIC)\java -I$(PUBLIC)\xpconnect -I$(PUBLIC)\libxpt -I$(PUBLIC)\xptinfo
+ -I$(PUBLIC)\java -I$(PUBLIC)\xpconnect -I$(PUBLIC)\libxpt -I$(PUBLIC)\xptinfo -I$(PUBLIC)\pref
 
 LCFLAGS = \
         $(LCFLAGS) \

dom/src/base/nsGlobalWindow.cpp

@@ -48,6 +48,7 @@
 #include "nsIScriptContextOwner.h"
 #include "nsIDocument.h"
 #include "nsIURL.h"
+#include "nsIPref.h"
 #include "nsCRT.h"
 #include "nsRect.h"
 #include "nsINetSupport.h"
@@ -87,6 +88,9 @@ static NS_DEFINE_IID(kINetServiceIID, NS_INETSERVICE_IID);
 static NS_DEFINE_IID(kNetServiceCID, NS_NETSERVICE_CID);
 static NS_DEFINE_IID(kINetSupportIID, NS_INETSUPPORT_IID);
 
+static NS_DEFINE_IID(kIPrefIID, NS_IPREF_IID);
+static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
+
 GlobalWindowImpl::GlobalWindowImpl()
 {
   NS_INIT_REFCNT();
@@ -829,9 +833,25 @@ GlobalWindowImpl::Back()
 NS_IMETHODIMP
 GlobalWindowImpl::Home()
 {
-  // XXX: This should look in the preferences to find the home URL. 
-  // Temporary hardcoded to www.netscape.com
-  nsString homeURL("http://www.netscape.com");
+  char *url = nsnull;
+  nsresult rv = NS_OK;
+  nsString homeURL;
+
+  NS_WITH_SERVICE(nsIPref, prefs, kPrefServiceCID, &rv);
+  if (NS_FAILED(rv) || (prefs == nsnull)) {
+      return rv;
+  }
+
+  // if we get here, we know prefs is not null
+  rv = prefs->CopyCharPref(PREF_BROWSER_STARTUP_HOMEPAGE, &url);
+  if (NS_FAILED(rv) || url == nsnull) {
+    // if all else fails, use this
+    homeURL = DEFAULT_HOME_PAGE;
+  }
+  else {
+    homeURL = url;
+  }
+  PR_FREEIF(url);
   PRUnichar* urlToLoad = homeURL.ToNewUnicode();
   mWebShell->LoadURL(urlToLoad);
   delete[] urlToLoad;

dom/src/base/nsGlobalWindow.h

@@ -35,6 +35,9 @@
 #include "nsDOMWindowList.h"
 #include "nsIDOMEventTarget.h"
 
+#define DEFAULT_HOME_PAGE "www.mozilla.org"
+#define PREF_BROWSER_STARTUP_HOMEPAGE "browser.startup.homepage"
+
 class nsIEventListenerManager;
 class nsIDOMDocument;
 class nsIPresContext;