ui/popup: ensure existing buffers are reused

This resolves an issue where the popup manager would open another popup
if a previous one had been raised. The popup manager now delegates to
the existing buffer if it already exists (without resizing it).

modules/ui/popup/autoload/popup.el

@@ -172,6 +172,13 @@ and enables `+popup-buffer-mode'."
          (alist (+popup--normalize-alist alist))
          (actions (or (cdr (assq 'actions alist))
                       +popup-default-display-buffer-actions)))
+    (or (let* ((alist (remove (assq 'window-width alist) alist))
+               (alist (remove (assq 'window-height alist) alist))
+               (window (display-buffer-reuse-window buffer alist)))
+          (when window
+            (unless +popup--inhibit-select
+              (select-window window))
+            window))
         (when-let* ((popup (cl-loop for func in actions
                                     if (funcall func buffer alist)
                                     return it)))
@@ -181,7 +188,7 @@ and enables `+popup-buffer-mode'."
               (if (functionp select)
                   (funcall select popup origin)
                 (select-window (if select popup origin)))))
-      popup)))
+          popup))))
 
 ;;;###autoload
 (defun +popup-parameter (parameter &optional window)