Please look at this simple script:
foo -[plain,thickness=16]-> bar1: [plain,16]
foo -[dashed,thickness=16]-> bar1: [dashed,16]
It is working in the editor we correctly get two thick lines:
While if I render this using the `plantuml.jar -gui` I get the plain line in its thin thickness.
It seems there is an issue with the plain line as every other style works...
Can anyone else reproduce this?