# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1374528008 -7200
# Node ID 68903dad01b908586b1be64ad6f7b1ee334fd1e1
# Parent  fe36f9b2b6a6eb6fa84db61485076faf845fc19d
Fixed timespan coverage scale construction where open-ended timespans are involved.

diff -r fe36f9b2b6a6 -r 68903dad01b9 EventAggregatorSupport/Filter.py
--- a/EventAggregatorSupport/Filter.py	Sat Jun 22 02:14:23 2013 +0200
+++ b/EventAggregatorSupport/Filter.py	Mon Jul 22 23:20:08 2013 +0200
@@ -256,6 +256,21 @@
 
     a_date, a_limit = a
     b_date, b_limit = b
+
+    # Handle None as the datetime.
+
+    a_before_everything = a_date is None and a_limit == START
+    a_after_everything = a_date is None and a_limit == END
+    b_before_everything = b_date is None and b_limit == START
+    b_after_everything = b_date is None and b_limit == END
+
+    if a_before_everything and b_before_everything or a_after_everything and b_after_everything:
+        return 0
+    elif a_before_everything or b_after_everything:
+        return -1
+    elif a_after_everything or b_before_everything:
+        return 1
+
     result = cmp_dates_as_day_start(a_date, b_date)
 
     if result == 0:
diff -r fe36f9b2b6a6 -r 68903dad01b9 README.txt
--- a/README.txt	Sat Jun 22 02:14:23 2013 +0200
+++ b/README.txt	Mon Jul 22 23:20:08 2013 +0200
@@ -362,6 +362,8 @@
   * Accessibility improvements: introduced table captions for the display of
     table headings; added link titles; supported the opening of pop-up menus
     and map labels using links and link targets.
+  * Fixed timespan coverage scale construction where open-ended timespans are
+    involved.
 
 New in EventAggregator 0.10.1 (Changes since EventAggregator 0.10)
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