syntax-highlighting on the rendered diagram

[MrCoder]

This is similar to a theme or you can even call it a theme which may become the default theme. The improvement is to assign more detailed colours/styles to rendered diagram.

What do you mean by "syntax-highlighting"?

"syntax-highlighting" means assigning colours and styles to the rules and tokens. It includes the font styling, background and borders.

List of rules and tokens can be find at sequenceParser.g4 and sequenceLexer.g4.

What colours should be used?

Follow Intellij IDEA's Light Theme:

ZenUML Rule/Token	Intellij Editor Element	Color	Bold	Italic	Background	Border
Participant	Class name	000000
Sync Message	Instance method	00627A
Async Message	Static method	00627A		Y
Comment	Block comment	8C8C8C		Y
Fragment (Alt, Loop, etc.)	Keyword	0033B3
stereotype	Annotation name	9E880D
Creation Message	Constructor declaration	00627A
Number in Atom	Number	1750EB

How does it impact inline colours? Can it be disabled?

When colours are used for different purpose on the same diagram, it introduces confusions. Theme must be explicitly enabled by a keyword. When the user tries to use inline styling, a warning should be given to tell the user to disable theme.