Load Margitte-Merging on top of Magritte default
To describe scenarios when a field should be merged automatically, set the #shouldAutoMergeBlock property to a condition block. For example, let's say you have a Name class with a #firstName field, and you want to merge whenever you're changing from an initial to a full first name starting with that letter:
Name>>#descriptionFirstName
<magritteDescription>
^ MAStringDescription new
accessor: #firstName;
propertyAt: #shouldAutoMergeBlock put: [ :old :new |
| oldNoPeriod |
oldNoPeriod := old trimRight: [ :e | e = $. ].
oldNoPeriod size = 1 and: [ new beginsWith: oldNoPeriod ] ];
yourself