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a5eb023a53
Problem: undoing after the prompt is changed breaks it (and causes init_prompt to abort it and append a new one), as the undo history contains the old prompt. Solution: like submitting, clear the undo buffer. Don't do it in init_prompt if the line was empty; that may not result in a new prompt, and causes commands like "S" to lose the history. As u_save, etc. wasn't being called by prompt_setprompt, undoing after it fixes the prompt usually gave undesirable results anyway. Remove the added undo_spec.lua test, as its approach no longer works as a repro, and finding a new one seems fiddly.