* lisp/help.el (help--analyze-key): Prefer posn-set-point over mouse-set-point

* lisp/help.el (help--analyze-key): Prefer posn-set-point over mouse-set-point

* lisp/help.el (help--analyze-key): Use posn-set-point instead of
mouse-set-point that runs the hook mouse-leave-buffer-hook via
mouse-minibuffer-check.  Using posn-set-point also unnecessitates
extra conditions added in bug#51421.

* lisp/isearch.el (isearch-describe-key, isearch-describe-mode):
Add precautions to not call isearch-update when the executed
command exited isearch-mode (bug#51173).