E.g.: kate :test doesn't work; opening via the file dialog should work after bug 322837 is fixed.
A possibly relevant merge request was started @ https://invent.kde.org/utilities/kate/-/merge_requests/134
Git commit 68dbf03bc7ce86f15ce82300159eb00db335bdeb by Christoph Cullmann, on behalf of Ahmad Samir. Committed on 02/01/2021 at 12:49. Pushed by cullmann into branch 'master'. UrlInfo: handle filenames starting with ':' QFile/QDir treat file paths starting with ':' as absolute paths (treated as Qt Resource (qrc) paths), which means such a path is always absolute from their POV. Adjust the code to be able to open files starting with ':' when kate is used on a relative path from the CLI. M +39 -26 urlinfo.h https://invent.kde.org/utilities/kate/commit/68dbf03bc7ce86f15ce82300159eb00db335bdeb