bug: PolylineMarker appears solid when stroke_pattern set to DashedStrokePattern

[Vulturu1]

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• I have searched the opened issues and there are no duplicates

Describe the bug

Hello. As the title says the issue I'm having is that when I add a PolylineMarker to my map with the DashedStrokePattern the line appears as if it's solid. I assume this may have something to do with the spacing between the individual dashes but ultimately I am not sure. I have tried to fix this using the segment argument in the DashedStrokePattern however that does not seem to have any effect at all. No idea why this is happening and I could not find any helpful resources online. Any fixes?

Code sample

Code

self.demo_line = ftm.PolylineMarker(coordinates=[ftm.MapLatitudeLongitude(center_lat, center_lon - 0.006), ftm.MapLatitudeLongitude(center_lat, center_lon + 0.006)], color=ft.Colors.WHITE, stroke_width=10, stroke_pattern=ftm.DashedStrokePattern())

To reproduce

Create a map object.
Create reference to PolylineLayer.
Add polyline to layer.

Expected behavior

No response

Screenshots / Videos

Captures

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Operating System

Windows

Operating system details

Windows 11

Flet version

0.28.3

Regression

I'm not sure / I don't know

Suggestions

No response

Logs

Logs

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Additional details

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[ndonkoHenri]

Attached PR will fix this issue.

Test code:

import flet as ft
import flet_map as ftm


def main(page: ft.Page):
    page.add(
        ftm.Map(
            expand=True,
            layers=[
                ftm.TileLayer(
                    url_template="https://tile.openstreetmap.org/{z}/{x}/{y}.png",
                    on_image_error=lambda e: print("TileLayer Error"),
                ),
                ftm.PolylineLayer(
                    polylines=[
                        ftm.PolylineMarker(
                            stroke_width=10,
                            color=ft.Colors.RED,
                            stroke_pattern=ftm.DashedStrokePattern(segments=[50, 20]),
                            coordinates=[
                                ftm.MapLatitudeLongitude(10, 10),
                                ftm.MapLatitudeLongitude(30, 15),
                                ftm.MapLatitudeLongitude(25, 45),
                            ],
                        ),
                    ],
                ),
            ],
        ),
    )


ft.run(main)