lisp/frameset.el: Allow orphaned minibufferless frames.
(frameset-filter-minibuffer): Deal with the case that the minibuffer parameter was already set in FILTERED. Doc fix. (frameset--record-minibuffer-relationships): Allow saving a minibufferless frame without its corresponding minibuffer frame. (frameset--reuse-frame): Accept a match from an orphaned minibufferless frame, if the frame id matches. (frameset--minibufferless-last-p): Sort non-orphaned minibufferless frames before orphaned ones. (frameset-restore): Warn about orphaned windows, instead of error out.
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