Fix off-center bubble pointer

Bubble position is calculated w.r.t left screen edge.
Pointer position is set w.r.t right end of expanded view left padding.
Add missing correction for expanded view left padding.

Fixes: 158621663
Test: pointer points to bubble center
Change-Id: I94d320b0b599865378d8297d50f555d5edd07203
diff --git a/packages/SystemUI/src/com/android/systemui/bubbles/BubbleExpandedView.java b/packages/SystemUI/src/com/android/systemui/bubbles/BubbleExpandedView.java
index 959130b..8722ac9 100644
--- a/packages/SystemUI/src/com/android/systemui/bubbles/BubbleExpandedView.java
+++ b/packages/SystemUI/src/com/android/systemui/bubbles/BubbleExpandedView.java
@@ -120,6 +120,8 @@
     private int mPointerWidth;
     private int mPointerHeight;
     private ShapeDrawable mPointerDrawable;
+    private int mExpandedViewPadding;
+
 
     @Nullable private Bubble mBubble;
 
@@ -345,11 +347,9 @@
             return view.onApplyWindowInsets(insets);
         });
 
-        final int expandedViewPadding =
-                res.getDimensionPixelSize(R.dimen.bubble_expanded_view_padding);
-
-        setPadding(
-                expandedViewPadding, expandedViewPadding, expandedViewPadding, expandedViewPadding);
+        mExpandedViewPadding = res.getDimensionPixelSize(R.dimen.bubble_expanded_view_padding);
+        setPadding(mExpandedViewPadding, mExpandedViewPadding, mExpandedViewPadding,
+                mExpandedViewPadding);
         setOnTouchListener((view, motionEvent) -> {
             if (!usingActivityView()) {
                 return false;
@@ -729,7 +729,7 @@
      */
     public void setPointerPosition(float x) {
         float halfPointerWidth = mPointerWidth / 2f;
-        float pointerLeft = x - halfPointerWidth;
+        float pointerLeft = x - halfPointerWidth - mExpandedViewPadding;
         mPointerView.setTranslationX(pointerLeft);
         mPointerView.setVisibility(VISIBLE);
     }