bug#53189: 29.0.50; Avoid window split in project-shell

[martin rudalics]

> In order to avoid splitting the current window when I open a shell-mode 
buffer with `project-shell' I have this in my init.el:
>
> (setq-default display-buffer-alist '((".+shell*"
>                                        (display-buffer-same-window)
>                                        (reusable-frames . nil))))
>
> The first time I use `C-x p s` I am getting the behaviour I want. But if I do 
this:
>
> - `C-x p s`
> - `C-x b RET`
> - `C-x p s`
>
> The current window is split and the shell-mode buffer appears on the
> side.
>
> How can I avoid the window splitting?

This should be Bug#52878.  Can you try with


diff --git a/lisp/window.el b/lisp/window.el
index 3f61d53128..068d76c87f 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -7474,9 +7474,10 @@ display-buffer-base-action
   :version "24.1"
   :group 'windows)

-(defcustom display-comint-buffer-action 'display-buffer-same-window
+(defcustom display-comint-buffer-action
+  '(display-buffer-same-window . ((inhibit-same-window . nil)))
   "The action to display a comint buffer."
-  :type display-buffer--action-function-custom-type
+  :type display-buffer--action-custom-type
   :risky t
   :version "29.1"
   :group 'windows


Which also means that your customization is no more necessary.

martin