Fix Citation List view Source Last Changed Column to sort properly (#723)

Fixes #10893

gramps/gui/views/treemodels/citationbasemodel.py

@@ -266,6 +266,18 @@ class CitationBaseModel:
             self.set_cached_value(source_handle, "SRC_CHAN", value)
         return value
 
+    def citation_src_sort_change(self, data):
+        source_handle = data[COLUMN_SOURCE]
+        cached, value = self.get_cached_value(source_handle, "SRC_CHAN")
+        if not cached:
+            try:
+                source = self.db.get_source_from_handle(source_handle)
+                value = "%012x" % source.change
+            except:
+                value = ''
+            self.set_cached_value(source_handle, "SRC_CHAN", value)
+        return value
+
 # Fields access when 'data' is a Source
 
     def source_src_title(self, data):

gramps/gui/views/treemodels/citationlistmodel.py

@@ -91,7 +91,7 @@ class CitationListModel(CitationBaseModel, FlatBaseModel):
             self.citation_src_abbr,
             self.citation_src_pinfo,
             self.citation_src_private,
-            self.citation_src_chan,
+            self.citation_src_sort_chan,
             self.citation_tag_color
             ]
         FlatBaseModel.__init__(self, db, uistate, scol, order, search=search,