Describe the bug
As indicated here: https://docs.microsoft.com/en-us/windows/uwp/design/shell/title-bar

Do make is obvious when your window is active or inactive. At a minimum, change the color of the text, icons, and buttons in your title bar.

This is even more true when High-Contrast is activated to improve accessibility.

The Calculator currently uses the same color when the window is active and inactive.

Steps To Reproduce

• Activate High-Contrast
• Launch the Calculator
• Switch between applications
  --> the Title bar color doesn't change.

Expected behavior

• the title bar should change color

Screenshots

Device and Application Information (please complete the following information):

• OS Build: 10.0.18362.0
• Architecture: X64
• Application Version: 10.1812.10048.0