Manual testing - tst_qmlsurfacelayers is not usable

In the manual test tst_qmlsurfacelayers, it is not possible to properly use the test. The Surface3D theme is set to Ebony, which comes with a black background that blends with the black text of the buttons used to properly use the manual test.

Expected behavior:

The text next to the buttons should be visible and allow you to see what option you are selecting.

The result in the image below was achieved by changing the theme from Ebony to Qt, in main.qml line 51.

Observed behavior:

The text next to the buttons are invisible because they blend in with the black background.