space before skin param stereotype causes all skinparams to be ignored

[VladimirAlexiev]

Describe the bug

I'll just cite what I added to the documentation of Skinned Stereotypes:

Important: unlike class stereotypes, there must be no space between the skin parameter and the following stereotype. Any of the spaces shown as _ below will cause all skinparams to be ignored, see discord discussion:

• BackgroundColor_<<Foo>>
• skinparam stereotypeCBackgroundColor_<<Foo>> DimGray

To Reproduce

This diagram looks as expected:

If you add a space between skinparam ClassBackgroundColor and <<Resource>> as in here, all skin params are lost:

@The-Lum who is the amazing Living Memory of plantuml helped me to figure this out, and doesn't think it's a bug.

But I think it's a bug: space is allowed in class foo <<stereotype>>: so why would it be forbidden in skin params?

[The-Lum]

Awaiting @arnaudroques answer...

Here is some element of answer taken from:

• Skinparam inconsistencies on class diagram grouping elements #1464 (comment)

Unfortunately, we won't fix issues in skinparam. Skinparam are still supported for very simple case (and for ascending compatibility) but we would like people to migrate to style instead. (The main reason is that code for skinparam is too old and not very well written).

There are also some issues in style (like the one you have found) but we do want to fix them.

Tell us if you have some issues in migrating towards style as we may help you to do so!

If that can help :-)
Regards,
Th.

[VladimirAlexiev]

added to http://alphadoc.plantuml.com/doc/markdown/en/skinparam#d6k5aty9xikgk362kjmj

Important: skinparam is being phased out, see comments in issue#1464. It is still supported for simple cases (and for backward compatibility), but users should migrate to style, which supports more complex cases.

Now I'll edit http://alphadoc.plantuml.com/doc/markdown/en/style-evolution because it reads like ancient history.