Quick reply...
Thank you, but I am not updating until night theme is usable in QML GUI (and mode image is used for the menu button).
For now, a question: there are were hard-coded values for "layers" in both PinchMap.qml and MapPage.qml. However, MapPage.qml values take precedence, as I found out while hard-coding my preferred values of mapnik-0.5 and vaer-0.5.
By the way, the slider for opacity can be somewhat annoying, especially when there is no way to check the exact value of opacity. Not that important, though, when I can simply hard-code them instead of going through Graphical-User-Interface.
Best wishes. Will post a screenshot later, probably. I am looking for filter-negative for QML Image.
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Per aspera ad astra...