Adding QT Colour Schemes to Kate when running Gnome (or how to get the dark mode back!)

If you've been running QT based applications under Gnome for long enough, it's likely that you'll eventually encounter issues with inconsistent theming and colour schemes when it comes to having QT and/or KDE based applications try to match or inherit parts of the Gnome / GTK theme you're running. Note that this scenario is not specific to Gnome, and you can experience this issue and also fix it the same way on other desktop environments. A particular example I've encountered occurred when moving from Fedora 32 to 33. The text editor Kate no longer uses a dark colour scheme if…

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