Xcode 9.x Line Duplication and Deletion

Question

Up until Xcode 8.0, it was possible to customize IDETextKeyBindingSet.plist file. However, now it seems like modifying this file causes Xcode to stop behaving normally (e.g. arr

Answer 1

Confirmed, still working in Xcode 11.2.1 on macOS Catalina 10.15.4

1. open /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Versions/A/Resources/IDETextKeyBindingSet.plist

2. Add the following lines into the root dictionary

    Sublime Commands
    
        Cut Current Line
        selectLine:, cut:
        Copy Current Line
        selectLine:, copy:
        Duplicate Current Line
        selectLine:, copy:, moveToBeginningOfLine:, paste:, moveToEndOfLine:
    

3. restart Xcode
4. go into the Key Bindings settings and assign any shortcut you want to the new three commands. Just search for their keys.

It's a shame that in the 21st century you still have to manually add such basic shortcuts.

Caveat

The steps have to be repeated after every update of Xcode.