Add parameter to Gtk3 and WinUI, and remove extraneous override in UIKit

Gtk3 and WinUI still only actually support .primary, but at least now
they'll compile.

Author: bbrk24

Sources/Gtk3Backend/Gtk3Backend.swift

@@ -934,7 +934,10 @@ public final class Gtk3Backend: AppBackend {
         gtk_native_dialog_show(chooser.gobjectPointer.cast())
     }
 
-    public func createTapGestureTarget(wrapping child: Widget) -> Widget {
+    public func createTapGestureTarget(wrapping child: Widget, gesture: TapGesture) -> Widget {
+        if gesture != .primary {
+            fatalError("Unsupported gesture type \(gesture)")
+        }
         let eventBox = Gtk3.EventBox()
         eventBox.setChild(to: child)
         eventBox.aboveChild = true
@@ -943,8 +946,12 @@ public final class Gtk3Backend: AppBackend {
 
     public func updateTapGestureTarget(
         _ tapGestureTarget: Widget,
+        gesture: TapGesture,
         action: @escaping () -> Void
     ) {
+        if gesture != .primary {
+            fatalError("Unsupported gesture type \(gesture)")
+        }
         tapGestureTarget.onButtonPress = { _, buttonEvent in
             let eventType = buttonEvent.type
             guard

Sources/UIKitBackend/UIKitBackend+Control.swift

@@ -129,10 +129,6 @@ final class TappableWidget: ContainerWidget {
         }
     }
 
-    override init(child: some WidgetProtocol) {
-        super.init(child: child)
-    }
-
     @objc
     func viewTouched() {
         onTap?()

Sources/WinUIBackend/WinUIBackend.swift

@@ -1014,7 +1014,10 @@ public final class WinUIBackend: AppBackend {
     // ) {
     // }
 
-    public func createTapGestureTarget(wrapping child: Widget) -> Widget {
+    public func createTapGestureTarget(wrapping child: Widget, gesture: TapGesture) -> Widget {
+        if gesture != .primary {
+            fatalError("Unsupported gesture type \(gesture)")
+        }
         let tapGestureTarget = TapGestureTarget()
         addChild(child, to: tapGestureTarget)
         tapGestureTarget.child = child
@@ -1037,8 +1040,12 @@ public final class WinUIBackend: AppBackend {
 
     public func updateTapGestureTarget(
         _ tapGestureTarget: Widget,
+        gesture: TapGesture,
         action: @escaping () -> Void
     ) {
+        if gesture != .primary {
+            fatalError("Unsupported gesture type \(gesture)")
+        }
         let tapGestureTarget = tapGestureTarget as! TapGestureTarget
         tapGestureTarget.clickHandler = action
         tapGestureTarget.width = tapGestureTarget.child!.width