(completion-in-region): Pop down *Completions* automatically.
* lisp/minibuffer.el (completion-table-dynamic): Optimize `boundaries'. (completion-in-region-mode): New minor mode. (completion-in-region): Use it. (completion-in-region--data, completion-in-region-mode-map): New vars. (completion-in-region--postch): New function. (completion--capf-misbehave-funs, completion--capf-safe-funs): New vars. (completion--capf-wrapper): New function. (completion-at-point): Use it to track well-behavedness of hook functions. (completion-help-at-point): New command.
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