added fixes for iOS-26

- picked code from PR
 - Fix ios 17.1+ issue slackhq#204
 - Update PanModalPresentationDelegate.swift slackhq#209

Author: rahulVermaSimpplr

PanModal/Controller/PanModalPresentationController.swift

@@ -177,6 +177,10 @@ open class PanModalPresentationController: UIPresentationController {
         guard let containerView = containerView
             else { return }
 
+        if self.panContainerView.frame == .zero {
+            self.adjustPresentedViewFrame()
+        }
+
         layoutBackgroundView(in: containerView)
         layoutPresentedView(in: containerView)
         configureScrollViewInsets()

PanModal/Delegate/PanModalPresentationDelegate.swift

@@ -52,7 +52,7 @@ extension PanModalPresentationDelegate: UIViewControllerTransitioningDelegate {
      Changes in size class during presentation are handled via the adaptive presentation delegate
      */
     public func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController? {
-        let controller = PanModalPresentationController(presentedViewController: presented, presenting: presenting)
+        let controller = PanModalPresentationController(presentedViewController: presented, presenting: presenting ?? source)
         controller.delegate = self
         return controller
     }