Color Sheme issue with GTK Theme

Hello

Dark themes version have trouble with XFCE4 Mousepad:

• Selected line
• Line number
• Everything stay white, without any difference.

Then it's just impossible to read the line number or the selected line text.

Like that:

Information Xfce 4.18 Gtk 3.24.43 Mousepad 0.6.2

I all ready have post a Issue on a Theme creator, and that trouble is reproductible with all Dark theme. Look like notohing can change the colorsheme from a gtk theme.

A Workarround exist by use view > Color Scheme > Dark Solarized color sheme

Here the link of issue open about it on Qogir theme creator: https://github.com/vinceliuice/Qogir-theme/issues/331