De: link mudou para corrigir a diferença na minha versão do NPP, mas deve estar perto da linha 89 ou 90.
By default Ctrl + Shift + L however you can change it to something like Shift + Del by going to the Settings menu, Shortcut Mapper, click on the Scintilla commands tab, scroll to command 89, "SCI_LINEDELETE" and adjust the shortcut from there. Valid as of Notepad++ 6.9.1