QML TextEdit selectionColor / selectedTextColor when using a QSyntaxHighlighter

[haiku]

Hi, I am writing a simple text editor using QML with some basic syntax highlighting delivered from a custom QSyntaxHighlighter class.

The result looks like this:

Beautiful! However when I select some text it ends up looking like this:

As you can see the text all becomes white. I would like the text colour to not change and to retain my syntax highlighting colours but I'm not sure how to do this with a TextEdit.
I know that the qml TextEdit component has properties for the selection colour (selectionColor) and the selected text color(selectedTextColor) but I see no way to have no selected text colour.

Hopefully there's an easy way here that I'm missing.