New buffer display action function 'display-buffer-in-direction'
* lisp/window.el (windows-sharing-edge) (window--try-to-split-window-in-direction) (display-buffer-in-direction): New functions. * doc/lispref/windows.texi (Buffer Display Action Functions): Describe new action function 'display-buffer-in-direction'. (Buffer Display Action Alists): Describe new entry 'direction'. Amend description of 'window' entry. * etc/NEWS: Mention 'display-buffer-in-direction' and 'direction' and 'window' action alist entries.
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