ensureSemantics() breaks onTap callback on Web platform

[ChemoCosmo]

What is the bug?

For enabling advanced accessibility for Web Screen Readers Flutter offers to set:

SemanticsBinding.instance.ensureSemantics();

See: https://blog.flutter.dev/accessibility-in-flutter-on-the-web-51bfc558b7d3

When enabled however, the onTap callback of FlutterMap is not handling the correct coordinates of the tap. Rather the displayed map center.

However LongTap is not affected.

I created a small demo project for the bug: https://gitlab.com/kybernetik/flutter-web-map-tap-test

You can clone and build it for web (see README).

onTap creates a marker at the wrong position. onLongTap at the right position.

This bug only affects the web version. onTap works fine in the Android Emulator, even with activated Semantics.

Since FlutterMap is the only Widget I encountered a problem with Semantics so far, I believe the bug report belongs here.

How can we reproduce it?

Activate SemanticsBinding.instance.ensureSemantics(); in main.dart main method and watch LatLng coordinates of FlutterMaps onTap callback.

Try demo project.

Do you have a potential solution?

No clue.

[JaffaKetchup]

Hey @ChemoCosmo,
Thanks for the report! I can reproduce this. It's a little strange and my immediately feeling would be it's a Flutter bug that all our other gestures somehow miss - but that doesn't make too much sense either.
I'll try and have a look into it :)