I am having Qt styling problems in FreeCAD using Linux Mint 19 Cinnamon.

In FreeCAD (a Qt-based app), some components of the dialog windows are extremely thin and unreadable:

enter image description here

Resizing the popup doesn't help - the textbox still remains the same size.

After doing a bit of testing, I've discovered that this problem only happens when the "gtk2" style (the "gtk2" style inherits from my default GTK theme: Adapta Nokto) is selected in qt5ct.

When I changed the Qt style to "cleanlooks", the problem went away:

enter image description here

Of course, now FreeCAD has a different theme, which I do not want.

How can I fix the Qt textboxes, while still keeping the Adapta Nokto theme?

Or, is there at least a decent dark Qt theme that I can use instead?

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