Allow gestures to go outside of board view

Tetris/Assets.xcassets/TempBackground.colorset/Contents.json

@@ -0,0 +1,38 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  },
+  "colors" : [
+    {
+      "idiom" : "universal",
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "red" : "1.000",
+          "alpha" : "1.000",
+          "blue" : "1.000",
+          "green" : "1.000"
+        }
+      }
+    },
+    {
+      "idiom" : "universal",
+      "appearances" : [
+        {
+          "appearance" : "luminosity",
+          "value" : "dark"
+        }
+      ],
+      "color" : {
+        "color-space" : "srgb",
+        "components" : {
+          "red" : "0.000",
+          "alpha" : "1.000",
+          "blue" : "0.000",
+          "green" : "0.000"
+        }
+      }
+    }
+  ]
+}

Tetris/ContentView.swift

@@ -41,7 +41,6 @@ struct ContentView: View {
                         .onAppear(perform: self.startTimer)
                         .onDisappear(perform: self.stopTimer)
                         .onTapGesture(perform: self.onTap)
-                        .gesture(self.horizDragGesture(geometry: geometry).simultaneously(with: self.verticalDragGesture))
                     //        .gesture(ExclusiveGesture(horizDragGesture, verticalDragGesture))
                     //            .gesture(horizDragGesture.simultaneously(with: verticalDragGesture))
                     
@@ -51,6 +50,8 @@ struct ContentView: View {
                     }
                         .padding(.trailing, 8)
                 }
+                    .background(Color("TempBackground")) // visually does nothing but lets the gesture work outside of the board, see FB7385742
+                    .gesture(self.horizDragGesture(geometry: geometry).simultaneously(with: self.verticalDragGesture))
                 Spacer()
                 HStack {
                     Button(action: { self.controller.rotate(direction: .counterClockwise) }) {