[PATCH] Filter registers before preview

[Evgenii Klimov]

Hi, I find registers very useful (especially with elaborate
`register-preview-function'), but as they become more and more numerous,
it gets difficult to select the right one, because every command
(`jump-to-register', `insert-register', etc.) shows every register in
the preview buffer, even if the register is not applicable in this
context.

The following is my attempt to deal with this issue.  If you find this
idea interesting then I can rewrite this patch to conform with
the surrounding code (cl-defgeneric/cl-defmethod) and your remarks.

0001-Filter-registers-before-preview.patch
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