Key for clearing the line in Helm / eshell / elsewhere

[luxbock]

The Emacs idiom for clearing the input line in modes such as Helm is simply to do C-a C-k, but Spacemacs overrides C-k for navigating down. As far as I know there is currently no key for clearing up the input line in Helm, which is surprising given how often I use this feature. This same issue is present in eshell, where C-k again navigates the input history.

I think it would make sense that for users of dotspacemacs-editing-style there would be a standard key-binding for clearing out the input line (and not saving it to kill-ring), but I'm not sure what key should be used for this operation. Helm's keymap is quite packed, so I think we should consider the keys that are still available there and apply it consistently elsewhere as well.

My suggestion would be C-;, as I don't think it's used for anything else right now. You can check what keys are already bound by doing SPC h d K RET helm-map.

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