## Summary - add a kill buffer to the text area and wire Ctrl+Y to yank it - capture text from Ctrl+W, Ctrl+U, and Ctrl+K operations into the kill buffer - add regression coverage ensuring the last kill can be yanked back Fixes #5017 ------ https://chatgpt.com/codex/tasks/task_i_68e95bf06c48832cbf3d2ba8fa2035d2