handle control-delete and shift-delete (bug #41078)

suite/common/win/platformBrowserBindings.xul

@@ -9,10 +9,14 @@
 <keyset id="globalKeySet" xulkey="ctrl">
 
 <!-- other keybindings for cut/copy/paste -->
-<key id="winAlternativeCutKey" keycode="VK_DELETE" shift="true"
+<key id="winAlternativeCutKey" keycode="VK_DELETE" shift="true" control="false" alt="false"
   onkeypress="
     var controller = document.commandDispatcher.getControllerForCommand('cmd_cut');
     controller.doCommand('cmd_cut');"/>
+<key id="winAlternateCopy2Key" keycode="VK_DELETE" shift="false" control="true" alt="false"
+  onkeypress="
+    var controller = document.commandDispatcher.getControllerForCommand('cmd_copy');
+    controller.doCommand('cmd_copy');"/>
 <key id="winAlternativeCopyKey" keycode="VK_INSERT" control="true"
   onkeypress="
     var controller = document.commandDispatcher.getControllerForCommand('cmd_copy');