Reset 'gnus-current-window-configuration' on edit-form exit.
* lisp/gnus/gnus.el: New variable gnus-prev-cwc.
* lisp/gnus/gnus-art.el (gnus-article-edit-mode):
New local variable gnus-prev-cwc.
(gnus-article-edit-article): Store original
gnus-current-window-configuration as gnus-prev-cwc.
(gnus-article-edit-done, gnus-article-edit-exit): Restore
gnus-current-window-configuration from gnus-prev-cwc.
* lisp/gnus/gnus-eform.el (gnus-edit-form-mode):
New local variable gnus-prev-cwc.
(gnus-edit-form): Store original
gnus-current-window-configuration as gnus-prev-cwc.
(gnus-edit-form-done, gnus-edit-form-exit): Restore
gnus-current-window-configuration from gnus-prev-cwc.