Widgets-Fix: Ported Widget compatibility for ios 18+ from altstore (#746)

AltWidget/ComplicationView.swift

@@ -82,6 +82,7 @@ struct ComplicationView: View
         }
         .gaugeStyle(.accessoryCircularCapacity)
         .unredacted()
+        .widgetBackground(Color.clear)
     }
 }
 

AltWidget/Extensions/View+AltWidget.swift

@@ -0,0 +1,27 @@
+//
+//  View+AltWidget.swift
+//  AltStore
+//
+//  Created by Riley Testut on 8/18/23.
+//  Copyright © 2023 Riley Testut. All rights reserved.
+//
+
+import SwiftUI
+
+extension View
+{
+    @ViewBuilder
+    func widgetBackground(_ backgroundView: some View) -> some View
+    {
+        if #available(iOSApplicationExtension 17, *)
+        {
+            containerBackground(for: .widget) {
+                backgroundView
+            }
+        }
+        else
+        {
+            background(backgroundView)
+        }
+    }
+}

AltWidget/WidgetView.swift

@@ -104,7 +104,8 @@ struct WidgetView : View
                 .frame(maxWidth: .infinity, maxHeight: .infinity)
             }
         }
-        .background(backgroundView(icon: entry.app?.icon, tintColor: entry.app?.tintColor))
+        .widgetBackground(backgroundView(icon: entry.app?.icon, tintColor: entry.app?.tintColor))
+
     }
 }