* helm.el (helm-read-pattern-maybe): Issue #175 Try to save-selected-window.
* helm.el (helm-compile-source--dummy): Add a fct entry only when needed.

* helm-buffers.el (helm-c-source-buffer-not-found): Don't specify fct.
* helm-help.el (helm-help-internal): Issue #175 Avoid using save-window-excursion. Don't modify mode-line.
(helm-help-event-loop): Use its own prompt.