[CalendarDatePicker] Incorrect icon margin when long header is set

[niels9001]

Describe the bug

When a long title is set on the CalendarDatePicker (exceeding it's MinWidth?) the spacing of the icon is incorrect and should stay consistent.

Steps to reproduce the bug

 <StackPanel Orientation="Vertical" Spacing="12">
     <CalendarDatePicker Header="CalendarDatePicker with a very long title" />
     <CalendarDatePicker Header="Short title" />
 </StackPanel>

NuGet package version

1.7.250310001

[niels9001]

This issue has been fixed in 1.8-stable