refactor(helm): use helm-posframe

The old, in-house implementation no longer works (and reportedly causes
crashes).

Ref: #6676
Co-authored-by: johanwiden <johanwiden@users.noreply.github.com>

modules/completion/helm/autoload/posframe.el

@@ -1,56 +0,0 @@
-;;; completion/helm/autoload/posframe.el -*- lexical-binding: t; -*-
-
-;;;###autoload
-(defun +helm-poshandler-frame-center-near-bottom-fn (info)
-  "Display the child frame in the center of the frame, slightly closer to the
-bottom, which is easier on the eyes on big displays."
-  (let ((parent-frame (plist-get info :parent-frame))
-        (pos (posframe-poshandler-frame-center info)))
-    (cons (car pos)
-          (truncate (/ (frame-pixel-height parent-frame)
-                       2)))))
-
-(defvar +helm--posframe-buffer nil)
-;;;###autoload
-(defun +helm-posframe-display-fn (buffer &optional _resume)
-  "TODO"
-  (setq helm--buffer-in-new-frame-p t)
-  (let ((params (copy-sequence +helm-posframe-parameters)))
-    (let-alist params
-      (require 'posframe)
-      (posframe-show
-       (setq +helm--posframe-buffer buffer)
-       :position (point)
-       :poshandler +helm-posframe-handler
-       :respect-header-line helm-echo-input-in-header-line
-       :min-width
-       (max (cl-typecase .width
-              (integer .width)
-              (float (truncate (* (frame-width) .width)))
-              (function (funcall .width))
-              (t 0))
-            .min-width)
-       :min-height
-       (max (cl-typecase .height
-              (integer .height)
-              (float (truncate (* (frame-height) .height)))
-              (function (funcall .height))
-              (t 0))
-            .min-height)
-       :override-parameters
-       (dolist (p '(width height min-width min-height) params)
-         (setq params (delq (assq p params) params)))))
-    ;;
-    (unless (or (null +helm-posframe-text-scale)
-                (= +helm-posframe-text-scale 0))
-      (with-current-buffer buffer
-        (text-scale-set +helm-posframe-text-scale)))))
-
-;;;###autoload
-(defun +helm-posframe-cleanup-h ()
-  "TODO"
-  ;; Ensure focus is properly returned to the underlying window. This gives the
-  ;; modeline a chance to refresh.
-  (switch-to-buffer +helm--posframe-buffer t))
-
-(add-hook 'helm-cleanup-hook #'+helm-posframe-cleanup-h)