Xcode - Duplicate Line key binding

duplicate_line_xcode.md

NOTE (2022-07-09): Xcode finally added this functionality in Xcode 14, please see release notes here:

New Features in Xcode 14 Beta 3
When editing code, the Edit > Duplicate menu item and its corresponding keyboard shortcut now duplicate the selected text — or the line that currently contains the insertion point, if no text is selected. (8614499) (FB5618491)

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Xcode line duplicate

Bind keys to duplicate lines in Xcode

1. Close Xcode

2. Open below directory in Finder with Cmnd + Shift + G

/Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Versions/A/Resources/

3. Open IDETextKeyBindingSet.plist with a text editor.

4. Add this in:

<key>Duplication</key>
<dict>
    <key>Duplicate Current Line</key>
    <string>moveToBeginningOfLine:, deleteToEndOfLine:, yank:, insertNewline:, moveToBeginningOfLine:, yank:</string>
    <key>Duplicate Lines</key>
    <string>selectLine:, copy:, moveToEndOfLine:, insertNewline:, paste:, deleteBackward:</string>
    <key>Delete Line</key>
    <string>selectLine:, deleteBackward:</string>
</dict>

5. Open Xcode and go to Xcode preferences -> Key Bindings -> Text tab -> Scroll till you see Duplication

6. Click on Duplicate Current Line, add a shortcut for it, eg. Cmnd + D (remove any other bindings for this key)

Thank you, but in my case, the 'Delete Line' feature often doesn't work with beep codes. In this case, if you search directly for the key to which it is mapped in the key bindings in the settings and then return to the editor, it works fine again, do you know what caused this bug and how to fix it?

Is there a way to hold down command + delete and have lines deleted one by one as in VSCode?