Merge changes from topic "fastScrollerPrivateSpaceDrawableToLetters" into main

* changes:
  Update letter list textview background color to spec.
  Remove color animations when scrolling.
diff --git a/res/drawable/bg_letter_list_text.xml b/res/drawable/bg_letter_list_text.xml
index 427702b..bfdd35c 100644
--- a/res/drawable/bg_letter_list_text.xml
+++ b/res/drawable/bg_letter_list_text.xml
@@ -15,7 +15,7 @@
   -->
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="oval">
-    <solid android:color="?attr/materialColorSurfaceContainer" />
+    <solid android:color="?attr/materialColorSurface" />
     <corners android:radius="100dp"/>
     <size
         android:width="@dimen/bg_letter_list_text_size"
diff --git a/src/com/android/launcher3/allapps/LetterListTextView.java b/src/com/android/launcher3/allapps/LetterListTextView.java
index 433a7f2..8586078 100644
--- a/src/com/android/launcher3/allapps/LetterListTextView.java
+++ b/src/com/android/launcher3/allapps/LetterListTextView.java
@@ -42,8 +42,6 @@
     private final Drawable mLetterBackground;
     private final int mLetterListTextWidthAndHeight;
     private final int mTextColor;
-    private final int mBackgroundColor;
-    private final int mSelectedColor;
 
     public LetterListTextView(Context context) {
         this(context, null, 0);
@@ -59,8 +57,6 @@
         mLetterListTextWidthAndHeight = context.getResources().getDimensionPixelSize(
                 R.dimen.fastscroll_list_letter_size);
         mTextColor = Themes.getAttrColor(context, R.attr.materialColorOnSurface);
-        mBackgroundColor = Themes.getAttrColor(context, R.attr.materialColorSurfaceContainer);
-        mSelectedColor = Themes.getAttrColor(context, R.attr.materialColorOnSecondary);
     }
 
     @Override
@@ -101,26 +97,11 @@
         float cutOffMin = currentFingerY - (getHeight() * 2);
         float cutOffMax = currentFingerY + (getHeight() * 2);
         float cutOffDistance = cutOffMax - cutOffMin;
-        // Update the background blend color
         boolean isWithinAnimationBounds = getY() < cutOffMax && getY() > cutOffMin;
-        if (isWithinAnimationBounds) {
-            getBackground().setColorFilter(new PorterDuffColorFilter(
-                    getBlendColorBasedOnYPosition(currentFingerY, cutOffDistance),
-                    PorterDuff.Mode.MULTIPLY));
-        } else {
-            getBackground().setColorFilter(new PorterDuffColorFilter(
-                    mBackgroundColor, PorterDuff.Mode.MULTIPLY));
-        }
         translateBasedOnYPosition(currentFingerY, cutOffDistance, isWithinAnimationBounds);
         scaleBasedOnYPosition(currentFingerY, cutOffDistance, isWithinAnimationBounds);
     }
 
-    private int getBlendColorBasedOnYPosition(int y, float cutOffDistance) {
-        float raisedCosineBlend = (float) Math.cos(((y - getY()) / (cutOffDistance)) * Math.PI);
-        float blendRatio = Utilities.boundToRange(raisedCosineBlend, 0f, 1f);
-        return ColorUtils.blendARGB(mBackgroundColor, mSelectedColor, blendRatio);
-    }
-
     private void scaleBasedOnYPosition(int y, float cutOffDistance,
             boolean isWithinAnimationBounds) {
         float raisedCosineScale = (float) Math.cos(((y - getY()) / (cutOffDistance)) * Math.PI)