Handle printPreview() failing better. Bug 275996, r=timeless, sr=neil

git-svn-id: svn://10.0.0.236/trunk@168365 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/xpfe/browser/resources/content/browser.js

@@ -258,8 +258,6 @@ function BrowserPrintPreview()
 
 function FinishPrintPreview()
 {
-  gInPrintPreviewMode = true;
-
   var browser = getBrowser();
   try {
     var ifreq = content.QueryInterface(Components.interfaces.nsIInterfaceRequestor);
@@ -269,6 +267,8 @@ function FinishPrintPreview()
       webBrowserPrint.printPreview(gPrintSettings, null, gWebProgress.value);
     }
 
+    gInPrintPreviewMode = true;
+
     browser.setAttribute("handleCtrlPageUpDown", "false");
 
     var mainWin = document.getElementById("main-window");