org-src.el: Add plain to org-src-window-setup customization

* lisp/org-src.el (org-src-window-setup): Add plain to the list of
valid choices for `org-src-window-setup'.

A previous change added it to the documentation and to the pcase that
process this variable in `org-src-switch-to-buffer', but the defcustom
did not include it as a valid option.

TINYCHANGE
This commit is contained in:
Matt Rudary 2022-07-08 11:56:55 -04:00 committed by Ihor Radchenko
parent b3b17cdb66
commit a7cc95c60c
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@ -171,6 +171,7 @@ Values that modify the window layout (reorganize-frame, split-window-below,
split-window-right) will restore the layout after exiting the edit buffer."
:group 'org-edit-structure
:type '(choice
(const plain)
(const current-window)
(const split-window-below)
(const split-window-right)