Do not let QS handle touches where clipped.

Fixes: 196002042
Fixes: 199657455
Bug: 193350347
Test: tap the status bar; unable to trigger any QS tile
Test: drag the QS open by a few mm; unable to trigger any QS tile
Test: open shade, scroll notifications to partially obscure a QS tile; tile is pressable down to the clip, but when clicking below the clip, the default "collapse shade" behavior kicks in.
Test: expand QS with 2 fingers; opens fully expanded QS
Test: fingerprint unlock; expand shade with 1 finger; occasionally opens fully expanded shade: b/193350347
Change-Id: Ie264ee69570f72f5653b423a8649663e3aab1df9

packages/SystemUI/src/com/android/systemui/qs/QSContainerImpl.java

@@ -23,6 +23,7 @@ import android.content.res.Configuration;
 import android.graphics.Canvas;
 import android.graphics.Path;
 import android.graphics.Point;
+import android.graphics.PointF;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.WindowInsets;
@@ -289,6 +290,16 @@ public class QSContainerImpl extends FrameLayout implements Dumpable {
         }
     }
 
+    @Override
+    protected boolean isTransformedTouchPointInView(float x, float y,
+            View child, PointF outLocalPoint) {
+        // Prevent touches outside the clipped area from propagating to a child in that area.
+        if (mClippingEnabled && y + getTranslationY() > mFancyClippingTop) {
+            return false;
+        }
+        return super.isTransformedTouchPointInView(x, y, child, outLocalPoint);
+    }
+
     private void updateClippingPath() {
         mFancyClippingPath.reset();
         if (!mClippingEnabled) {