This change makes it possible to use "complex" shape names (e.g. "Email__Wrapper"). Before this change, the shape file name syntax was required (e.g. "Email-Wrapper").
However, such shapes would not be found when using the {Shape.Execute} token when using the other syntax (e.g. "Email__Wrapper"), since TemplateShapeDisplayEvent simply register the shapes by specified title without first translating the file based syntax to code based syntax.