Completion Preview mode implicitly assumed that
'completion-ignore-case' is nil, and while it can also work
with 'completion-ignore-case' non-nil, the results are a bit
different than what you get with 'completion-at-point'. Add
an option that controls case sensitivity explicitly and
specifically for Completion Preview mode, and clarify the
behavior when case differences are ignored. (Bug#73234)
* lisp/completion-preview.el
(completion-preview-ignore-case): New user option.
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