feature/workspaces: fix buffer getting killed across workspaces

modules/feature/workspaces/autoload/workspaces.el

@@ -453,6 +453,12 @@ the next."
 ;; Hooks
 ;;
 
+;;;###autoload
+(defun +workspaces|protect-buffers-in-other-persps ()
+  "Return nil if this buffer is present in other perspectives/workspaces (bury
+it, don't kill it)."
+  (not (persp-other-persps-with-buffer-except-nil (current-buffer))))
+
 ;;;###autoload
 (defun +workspaces|delete-associated-workspace (&optional frame)
   "Delete workspace associated with current frame.