detect sort descriptors when table column is added

AppKit/CPTableView.j

@@ -870,6 +870,17 @@ CPTableViewFirstColumnOnlyAutoresizingStyle = 5;
     else
         _dirtyTableColumnRangeIndex = MIN(NUMBER_OF_COLUMNS() - 1, _dirtyTableColumnRangeIndex);
 
+    if ([[self sortDescriptors] count] > 0)
+    {
+        var mainSortDescriptor = [[self sortDescriptors] objectAtIndex:0];
+
+        if (aTableColumn === [self _tableColumnForSortDescriptor:mainSortDescriptor])
+        {
+            var image = [mainSortDescriptor ascending] ? [self _tableHeaderSortImage] : [self _tableHeaderReverseSortImage];
+            [self setIndicatorImage:image inTableColumn:aTableColumn];
+        }
+    }
+
     [self tile];
     [self setNeedsLayout];
 }