Environment

Windows build number: 10.0.18362.476
Windows Terminal version (if applicable): 0.7.3382.0

Steps to reproduce

Have Windows configured in "light mode", and configure Terminal with requestedTheme set to dark. Split a tab in two or more panels.

Expected behavior

The split background should be dark, matching the tabs. The current panel is highlighted with the accent colour.

Actual behavior

The split background is light, matching the system theme (in particular the "app mode" setting), and ignores the requestedTheme Terminal setting. Next to a light grey line, the accent colour is less visible.

The opposite is also true: set windows to "dark mode", Terminal to "light mode", and the splits will follow the system settings.