allow directory creation when saving files/attachments. patch by Hiro. b=360948 r=josh sr=pinkerton (re-landing)

git-svn-id: svn://10.0.0.236/trunk@215674 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/widget/src/cocoa/nsFilePicker.mm

@@ -304,6 +304,7 @@ nsFilePicker::GetLocalFolder(const nsString& inTitle, nsILocalFile** outFile)
   [thePanel setCanChooseDirectories:YES];
   [thePanel setCanChooseFiles:NO];
   [thePanel setResolvesAliases:YES];          //this is default - probably doesn't need to be set
+  [thePanel setCanCreateDirectories:YES];
   
   // packages != folders
   [thePanel setTreatsFilePackagesAsDirectories:NO];