Add support to recive MotionEvent.ACTION_OUTSIDE

[madushan1000]

This is useful to dismiss overlay windows when the user taps something outside the overlay window(like google translate overlay).
I patched the package this way to make my use-case work, but it's not a general solution.

diff --git a/android/src/main/java/flutter/overlay/window/flutter_overlay_window/OverlayService.java b/android/src/main/java/flutter/overlay/window/flutter_overlay_window/OverlayService.java
index f50d6a3..6a613cd 100644
--- a/android/src/main/java/flutter/overlay/window/flutter_overlay_window/OverlayService.java
+++ b/android/src/main/java/flutter/overlay/window/flutter_overlay_window/OverlayService.java
@@ -167,7 +167,8 @@ public class OverlayService extends Service implements View.OnTouchListener {
                 WindowSetup.flag | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS
                         | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
                         | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR
-                        | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED,
+                        | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED
+                        | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
                 PixelFormat.TRANSLUCENT
         );
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S && WindowSetup.flag == clickableFlag) {
@@ -407,6 +408,12 @@ public class OverlayService extends Service implements View.OnTouchListener {
                     }
                     dragging = true;
                     break;
+                case MotionEvent.ACTION_OUTSIDE:
+                    if (OverlayService.isRunning) {
+                        Context context = getApplicationContext();
+                        final Intent i = new Intent(context, OverlayService.class);
+                        context.stopService(i);
+                    }
                 case MotionEvent.ACTION_UP:
                 case MotionEvent.ACTION_CANCEL:
                     lastYPosition = params.y;
@@ -468,4 +475,4 @@ public class OverlayService extends Service implements View.OnTouchListener {
     }
 
 
-}
\ No newline at end of file
+}