# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1509575006 -3600
# Node ID 79ff5b0a199c4e256975624446d6578c8326b173
# Parent  9baa0aae5b43c4c2a6539bdc867174d116dc4f4a
Update the sequence number when modifying existing separate recurrences.

diff -r 9baa0aae5b43 -r 79ff5b0a199c imiptools/client.py
--- a/imiptools/client.py	Tue Oct 31 23:49:04 2017 +0100
+++ b/imiptools/client.py	Wed Nov 01 23:23:26 2017 +0100
@@ -876,6 +876,9 @@
                 # Attempt to find an existing recurrence.
 
                 obj = self.get_stored_object(self.uid, p.get_recurrenceid())
+
+                # Use the template without an existing recurrence.
+
                 if not obj:
                     obj = template.copy()
 
@@ -886,6 +889,16 @@
                     dt, attr = p.get_recurrenceid_item()
                     obj["RECURRENCE-ID"] = [(format_datetime(dt), attr)]
 
+                # Update any sequence number if the period has changed from any
+                # stored version.
+                # NOTE: Attendance changes would also be propagated and have
+                # NOTE: this effect.
+
+                else:
+                    main = obj.get_main_period()
+                    if main != p:
+                        self.update_sequence(obj)
+
                 # Set specific recurrence information.
 
                 obj.set_datetime("DTSTART", p.get_start())