* comint.el (comint-previous-input): Don't clobber input line
when moving off either end of the input history ring. (comint-delete-input): New function, used by `comint-previous-input' and others. (comint-previous-matching-input): Use `coming-delete-input'. Save the partial input if leaving the edit line. Goto point-max before deleting input to avoid partial input fragments hanging around. (comint-restore-input): New function, used by `comint-previous-input', and bound to [C-c C-g].
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