Add View+AlertExtensions.swift

src/apps/share/swift/Views/View+AlertExtensions.swift

@@ -0,0 +1,34 @@
+import SwiftUI
+
+// In principle, native SwiftUI mechanisms such as sheet should be used to display dialogs.
+// However, in the case of dialogs that need to be displayed regardless of user interaction,
+// such as Input Monitoring permission requests, sheet and the like have the following problems:
+//
+// - Cannot quit the application while the sheet is displayed
+// - Cannot minimize the application while the sheet is displayed
+// - Cannot restart OS while the sheet is displayed
+//
+// This view is intended for use only when such constraints are problematic.
+
+extension View {
+  @ViewBuilder func `alert`<Content: View>(isPresented: Bool, view: () -> Content) -> some View {
+    if isPresented {
+      self.overlay(
+        ZStack {
+          Rectangle()
+            .fill(Color(NSColor.controlBackgroundColor).opacity(0.8))
+        }.overlay(
+          view()
+            .padding()
+            .background(Color(NSColor.controlBackgroundColor))
+            .overlay(
+              RoundedRectangle(cornerRadius: 16)
+                .stroke(Color(NSColor.controlTextColor), lineWidth: 2)
+            )
+        )
+      )
+    } else {
+      self
+    }
+  }
+}