LT-3646: Unchecked checkboxes count as "no data"

When determining field visibility, treat unchecked checkboxes
as if they have "no data".

Note:  This change applies to all checkboxes stored as a Boolean,
and one checkbox that is stored as an integer.  To apply the new
behavior to a checkbox stored as an integer, and avoid changing
the behavior of all integer fields, we specifically identify the
integer field. There is a possibility that we missed other checkbox
fields that are stored as an integer.

Author: mark-sil

Src/Common/Controls/DetailControls/DataTree.cs

@@ -2807,6 +2807,15 @@ private NodeTestResult AddSimpleNode(ArrayList path, XmlNode node, ObjSeqHashMap
 							if (realSda.get_StringProp(obj.Hvo, flid).Length == 0)
 								return NodeTestResult.kntrNothing;
 							break;
+						case CellarPropertyType.Boolean:
+							if (realSda.get_BooleanProp(obj.Hvo, flid) == false)
+								return NodeTestResult.kntrNothing;
+							break;
+						case CellarPropertyType.Integer:
+							// 'Show Minor Entry' is displayed as a checkbox.
+							if (flid == LexEntryRefTags.kflidHideMinorEntry && realSda.get_IntProp(obj.Hvo, flid) != 0)
+								return NodeTestResult.kntrNothing;
+							break;
 						case CellarPropertyType.Unicode:
 							string val = realSda.get_UnicodeProp(obj.Hvo, flid);
 							if (string.IsNullOrEmpty(val))