Error when drawing arrow linestyle with specific measures in gantt diagrams

[kkrafft1999]

Describe the bug
When I put an arrow styling within the gannt diagram style:

@startgantt
<style>
ganttDiagram {
	arrow {
        LineStyle 8.0;13.0
	}
}
</style>
...
@endgantt

This result in a pasrsing error.

To Reproduce
Steps to reproduce the behavior:

Just put the styling above in your pgantt diagram

Expected behavior
Arrows should be drawn with the specific styling linestyle parameters

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• Windows 10

[laurateixeir]

After reviewing the guide and the documentation for the gantt diagramm and checking the code i found out that it is possible to apply the linestyle. Instead of a semicolon it is possible to just use a dash. When using the dash the Linestyle 8.0-13.0 is slightly different from using 8.0;13.0.

This is because the LineStyle only can be set like that when LineThickness is set also. Somehow the LineStyle relies on the LineThickness. I am still trying to figure out where in the code this is set.

With dash:

@startgantt

<style>
timeline {
    BackGroundColor Grey
    FontName Helvetica
    FontSize 20
    FontColor Blue
}
arrow {

    LineStyle 8.0-13.0

}

</style>

[Task1] lasts 20 days
note bottom
 memo1 ...
 memo2 ...
 explanations1 ...
 explanations2 ...
end note

[Task2] lasts 4 days
[Task2] starts 3 days after [Task1]'s end
[Task1] -> [Task2]
-- Seperator Title --

[M1] happens on 5 days after [Task1]'s end

-- end --

@endgantt

Output:

With LineThickness:

@startgantt

<style>
timeline {
    BackGroundColor Grey
    FontName Helvetica
    FontSize 20
    FontColor Blue
}
arrow {
    LineStyle 8.0;13.0
    LineThickness 1.0
}

</style>

[Task1] lasts 20 days
note bottom
 memo1 ...
 memo2 ...
 explanations1 ...
 explanations2 ...
end note

[Task2] lasts 4 days
[Task2] starts 3 days after [Task1]'s end
[Task1] -> [Task2]
-- Seperator Title --

[M1] happens on 5 days after [Task1]'s end

-- end --

@endgantt

Output:

[laurateixeir]

In the class UStroke (package net.sourceforge.plantuml.klimt;) i found the dependency for the Linethickness.

	public UStroke(double dashVisible, double dashSpace, double thickness) {
		this.dashVisible = dashVisible;
		this.dashSpace = dashSpace;
		this.thickness = thickness;
	}

also you can see here in the class GantArrow (package net.sourceforge.plantuml.project;) in the method drawU that the Thickness is given here so this could be the reason why it is not possible to set the measure without it.

ug = ug.apply(UStroke.withThickness(1.5)).apply(style.value(PName.LineColor).asColor(colorSet).bg());