Determine if NPVC is intercepting touches from footer

In normal cases, in taps on the FooterActionsView area, we should see
NPVC#onInterceptTouchEvent called and then
FooterActionsView#onInterceptTouchEvent. However, if NPVC is
intercepting the touches, the second call won't happen.

To enable, run:
adb shell setprop log.tag.PanelView VERBOSE
adb shell setprop log.tag.FooterActionsView VERBOSE
adb shell am crash com.android.systemui

This will restart SystemUI so needs to be done before observing the
issue.

Bug: 235072946
Test: logcat
Change-Id: Ie0eaf9441162fc380ed373916a2acd824c8da930

packages/SystemUI/src/com/android/systemui/qs/FooterActionsView.kt

@@ -22,6 +22,8 @@ import android.graphics.drawable.Drawable
 import android.graphics.drawable.RippleDrawable
 import android.os.UserManager
 import android.util.AttributeSet
+import android.util.Log
+import android.view.MotionEvent
 import android.view.View
 import android.widget.ImageView
 import android.widget.LinearLayout
@@ -101,4 +103,18 @@ class FooterActionsView(context: Context?, attrs: AttributeSet?) : LinearLayout(
         }
         multiUserAvatar.setImageDrawable(pictureToSet)
     }
-}
+
+    override fun onInterceptTouchEvent(ev: MotionEvent?): Boolean {
+        if (VERBOSE) Log.d(TAG, "FooterActionsView onInterceptTouchEvent ${ev?.string}")
+        return super.onInterceptTouchEvent(ev)
+    }
+
+    override fun onTouchEvent(event: MotionEvent?): Boolean {
+        if (VERBOSE) Log.d(TAG, "FooterActionsView onTouchEvent ${event?.string}")
+        return super.onTouchEvent(event)
+    }
+}
+private const val TAG = "FooterActionsView"
+private val VERBOSE = Log.isLoggable(TAG, Log.VERBOSE)
+private val MotionEvent.string
+    get() = "($id): ($x,$y)"

packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelViewController.java

@@ -4142,6 +4142,11 @@ public class NotificationPanelViewController extends PanelViewController {
 
             @Override
             public boolean onInterceptTouchEvent(MotionEvent event) {
+                if (SPEW_LOGCAT) {
+                    Log.v(TAG,
+                            "NPVC onInterceptTouchEvent (" + event.getId() + "): (" + event.getX()
+                                    + "," + event.getY() + ")");
+                }
                 if (mBlockTouches || mQs.disallowPanelTouches()) {
                     return false;
                 }