SUMMARY Move and add shortcuts that manipulate tabs to system settings: Konsole has detach current tab. Dolphin and kate have detach tab on clicked tab - while no shortcut for detaching current tab.
It's because there actually are no global actions/shortcuts for these. Right now each tab-based app implements them in a bespoke way. Ideally that wouldn't be the case, and attaching/detach/drag/drop would be standardized. We could also create global action stubs for them and have these apps use them, in preparation for the functionality itself being standardized.