Svg backend cannot draw annular_wedge correctly [BUG]

[ruoyu0088]

Here is the code:

from bokeh.plotting import figure, show

p = figure(plot_width=400, plot_height=400, output_backend="svg")
p.annular_wedge(x=[1, 2, 3], y=[1, 2, 3], inner_radius=0.1, outer_radius=0.25,
                start_angle=0.4, end_angle=4.8, color="green", alpha=0.6)

show(p)

and the output:

[bryevdv]

Confirmed this on master. @ruoyu0088 please always provide the requested version information.

Unfortunately, Bokeh relies on a third party library for Canvas<->SVG conversion, and this bug is almost certainly in that library. It's possible that there is simply a new version we can update to that fixes the problem, but AFAIK it is not under heavy development, so I am not to hopeful of that. Just to set expectations: if we have to fix things ourselves on our fork of the library, it will probably not be done anytime soon.

[mattpap]

(...) but AFAIK it is not under heavy development (...)

canvas2svg isn't maintained anymore, so we shouldn't expect any bug fixes like that happen on its own. I think we will have to look into alternatives in the long term.

[github-actions]

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