Calendar range selection styling is broken in the fluent theme

[simeonoff]

Description

When selecting a range of dates in the calendar, the styles look broken in the fluent theme.

Steps to reproduce

1. Open the calendar story
2. Change the selection mode to 'range'
3. Change the theme to fluent
4. Select a range of dates

Result

The border around the selected dates extends beyond that the start and end dates.

Expected result

The border should match the start and end dates in the range.

Attachments