Xamarin.Forms.Maps.Map.MapElements.Clear() seems effectless

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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Xamarin.Forms 4.4.0.991265
Xamarin.Forms.Maps 4.4.0.991265
VS 16.4.1 and 16.5 Preview 1

Android project (Api 28):
In my first attempt for a Xamarin App with Maps I insert polygons into the MapElements collection on VisibleRegion changes. Before inserting new polygons I clear the MapElements collection but in the display the (old) polygons remain and are overlayed with the newly added ones. So I get memory problems after a short time.
Looks like clearing the MapElements collection (the Count changes to 0) does not remove the corresponding elemnts from the google map.

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Original Comments

Visual Studio Feedback System on 12/13/2019, 02:30 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

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Original Solutions

(no solutions)

[jcmanke]

This was fixed in #7401.

[owe-eorg]

This issue has not yet been fixed and I honestly don't know why. They still update xamarin.forms.maps but don't care for such an essential flaw. Am I missing out on something?

[jfversluis]

@owe-eorg what isn't fixed according to you? As @jcmanke pointed out this might be fixed by the mentioned PR. Did you verify that this still doesn't work? And for what version?

[owe-eorg]

@jfversluis I'm using a vs xamarin.forms project with the current xamarin.forms.maps nuget packet (4.5.0.657).
MAP_myMap.MapElements.Clear(); does not remove the Mapelements from the GUI. Only after reinitializing/ restarting the App, the MapElements are cleared from the GUI. It's mostlikely the very same issue.

Edit: The PR seems to not have passed a few checks, so that might also be why it's still broken (Card link: https://github.com/xamarin/Xamarin.Forms/projects/55#card-32347330)

[jfversluis]

I have just verified that this works in the current 4.6-pre4 package. 4.6 stable should be out in a few hours from now so keep your eye out for that.

You can try my (working) reproduction with the 4.6-pre4 package here:
Repro9096.zip

Closing this one for now. If you find it not working in 4.6 please let me know