Reproduction:

• In the Flutter repo, cd dev/a11y_assessments.
• flutter run
• Enable the additional use-cases using the switch in the top-right corner of the app
• Open the RangeSlider use-case.
• Click on the track (not the thumbs) to adjust the start/end values.

Expected behavior

The thumb closest to the mouse cursor should move to the cursor position.

Actual behavior

Thumbs do not react to the click at all.

Internal issue: b/434778923