(key-sequence): Rework widget to read key binding
using `kbd' syntax. Use C-q to insert literal key, event, or code. (widget-key-sequence-default-value): Default value for empty sequence. (widget-key-sequence-map): New map for reading key binding. Bind C-q. (widget-key-sequence-read-event): New command for C-q. (widget-key-sequence-validate, widget-key-sequence-value-to-internal) (widget-key-sequence-value-to-external): New functions.
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