I guess because of a rapid evolution some parts of Roassal are weird. For example
RTAbstractLine>>#updateFor:trachelShape: implements the shape drawing, so
theoretically RTLine has to only override #trachelShapeClass to return TRLine. Instead
RTLine overrides #trachelShapeFor: and does it incorrectly, because width cannot be used
as a block but only as a number.
We have to handle this somehow, because 1) RTLine works incorrectly. 2) RTLine ignores the
implementation strategy coded into RTAbstractLine.