Index: 09_appendix/action_src/undo.html
===================================================================
--- 09_appendix/action_src/undo.html (revision 33389)
+++ 09_appendix/action_src/undo.html (revision 33390)
@@ -8,4 +8,13 @@
Note that undo groups operations by serial number; changes with the
same serial number will be undone (or redone) as a group. See
Atomic.
-
+
+The following arguments are intended for scripting:
+
+ - FreezeSerial: stop increasing the undo serial number
+
- UnFreezeSerial: stop increasing the undo serial number
+
- 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
+
- Above, sernum: perform undo of all operations with serial number higher than sernum
+