PatchedHighPriorityGesture.swift

import SwiftUI

// Works around a critical issue observed on iPads with a trackpad cursor.
//
// With highPriorityGesture, other interactive content on the screen can become unresponsive after
// triggering the gesture with an iPad cursor. It's as if the gesture seems to never relinquish its
// grasp on the entire UI, until you interact with the screen directly with a tap or trigger a
// context menu.
//
// This view modifier and extension works around this by forcing the gesture to be "cancelled" by
// making it temporarily disabled through a .none gesture mask, then toggling it back to its default
// mask after an instant.
public struct PatchedHighPriorityGesture<G: Gesture>: ViewModifier {
    private let gesture: G
    private let mask: GestureMask

    @State private var disableGesture = false

    public init(gesture: G, including mask: GestureMask) {
        self.gesture = gesture
        self.mask = mask
    }

    private var patchedGesture: some Gesture {
        gesture.onEnded { _ in
            self.disableGesture = true

            DispatchQueue.main.asyncAfter(deadline: .now() + TimeInterval(0.5)) {
                self.disableGesture = false
            }
        }
    }

    public func body(content: Content) -> some View {
        content
            .highPriorityGesture(patchedGesture, including: disableGesture ? .none : mask)
    }
}

public extension View {
    func patchedHighPriorityGesture<G: Gesture>(gesture: G, including mask: GestureMask) -> some View {
        modifier(PatchedHighPriorityGesture(gesture: gesture, including: mask))
    }
}

Submitted feedback to Apple with hopes that this gets fixed in a future SwiftUI update. FB9090392