Index: 09_appendix/action_src/undo.html
===================================================================
--- 09_appendix/action_src/undo.html (revision 34203)
+++ 09_appendix/action_src/undo.html (revision 34204)
@@ -13,6 +13,8 @@
- FreezeSerial: stop increasing the undo serial number
- UnFreezeSerial: stop increasing the undo serial number
+
- FreezeAdd: stop adding operations to the undo list
+
- UnFreezeAdd: start adding operations to the undo list again
- IncSerial: increase the undo serial number (operations with the same serial number are batched); a typical sequence for batching operations is: Undo(FreezeSerial); ...; Undo(UnFreezeSerial); Undo(IcSerial)
- GetSerial: return the current undo serial
- GetNum: return the number of undo slots currently allocated