Merge changes Iab1de455,I0c6585e6,I125670d1 into main

* changes:
  [Predictive Back] Recover taskbar all apps scale to 1f with animation if user swipe back within search [3/n]
  [Predictive Back] Dismiss taskbar all apps's scroll bar during swipe gesture [2/n]
  [Predictive Back] Fix predictive back swipe on task bar all apps [1/n]

quickstep/src/com/android/launcher3/taskbar/allapps/TaskbarAllAppsSlideInView.java

@@ -35,6 +35,7 @@ import androidx.annotation.Nullable;
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.Insettable;
 import com.android.launcher3.R;
+import com.android.launcher3.allapps.AllAppsRecyclerView;
 import com.android.launcher3.anim.AnimatorListeners;
 import com.android.launcher3.anim.PendingAnimation;
 import com.android.launcher3.config.FeatureFlags;
@@ -196,7 +197,13 @@ public class TaskbarAllAppsSlideInView extends AbstractSlideInView<TaskbarOverla
 
     @Override
     protected void dispatchDraw(Canvas canvas) {
-        mAppsView.drawOnScrimWithScale(canvas, mSlideInViewScale.value);
+        // We should call drawOnScrimWithBottomOffset() rather than drawOnScrimWithScale(). Because
+        // for taskbar all apps, the scrim view is a child view of AbstractSlideInView. Thus scaling
+        // down in AbstractSlideInView#onScaleProgressChanged() with SCALE_PROPERTY has already
+        // done the job - there is no need to re-apply scale effect here. But it also means we need
+        // to pass extra bottom offset to background scrim to fill the bottom gap during predictive
+        // back swipe.
+        mAppsView.drawOnScrimWithBottomOffset(canvas, getBottomOffsetPx());
         super.dispatchDraw(canvas);
     }
 
@@ -205,6 +212,11 @@ public class TaskbarAllAppsSlideInView extends AbstractSlideInView<TaskbarOverla
         super.onScaleProgressChanged();
         mAppsView.setClipChildren(!mIsBackProgressing);
         mAppsView.getAppsRecyclerViewContainer().setClipChildren(!mIsBackProgressing);
+        AllAppsRecyclerView rv = mAppsView.getActiveRecyclerView();
+        if (rv != null && rv.getScrollbar() != null) {
+            rv.getScrollbar().setVisibility(
+                    mIsBackProgressing ? INVISIBLE : VISIBLE);
+        }
     }
 
     @Override
@@ -255,7 +267,11 @@ public class TaskbarAllAppsSlideInView extends AbstractSlideInView<TaskbarOverla
 
     @Override
     public void onBackInvoked() {
-        if (!mAllAppsCallbacks.handleSearchBackInvoked()) {
+        if (mAllAppsCallbacks.handleSearchBackInvoked()) {
+            // We need to scale back taskbar all apps if we navigate back within search inside all
+            // apps
+            animateSlideInViewToNoScale();
+        } else {
             super.onBackInvoked();
         }
     }

src/com/android/launcher3/allapps/ActivityAllAppsContainerView.java

@@ -1372,7 +1372,8 @@ public class ActivityAllAppsContainerView<T extends Context & ActivityContext>
     }
 
     @Override
-    public void drawOnScrimWithScale(Canvas canvas, float scale) {
+    public void drawOnScrimWithScaleAndBottomOffset(
+            Canvas canvas, float scale, @Px int bottomOffsetPx) {
         final View panel = mBottomSheetBackground;
         final boolean hasBottomSheet = panel.getVisibility() == VISIBLE;
         final float translationY = ((View) panel.getParent()).getTranslationY();
@@ -1384,6 +1385,7 @@ public class ActivityAllAppsContainerView<T extends Context & ActivityContext>
         final float topWithScale = topNoScale + verticalScaleOffset;
         final float leftWithScale = panel.getLeft() + horizontalScaleOffset;
         final float rightWithScale = panel.getRight() - horizontalScaleOffset;
+        final float bottomWithOffset = panel.getBottom() + bottomOffsetPx;
         // Draw full background panel for tablets.
         if (hasBottomSheet) {
             mHeaderPaint.setColor(mBottomSheetBackgroundColor);
@@ -1393,7 +1395,7 @@ public class ActivityAllAppsContainerView<T extends Context & ActivityContext>
                     leftWithScale,
                     topWithScale,
                     rightWithScale,
-                    panel.getBottom());
+                    bottomWithOffset);
             mTmpPath.reset();
             mTmpPath.addRoundRect(mTmpRectF, mBottomSheetCornerRadii, Direction.CW);
             canvas.drawPath(mTmpPath, mHeaderPaint);

src/com/android/launcher3/views/ScrimView.java

@@ -26,6 +26,7 @@ import android.util.AttributeSet;
 import android.view.View;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Px;
 import androidx.core.graphics.ColorUtils;
 
 import com.android.launcher3.BaseActivity;
@@ -187,9 +188,19 @@ public class ScrimView extends View implements Insettable {
      * A Utility interface allowing for other surfaces to draw on ScrimView
      */
     public interface ScrimDrawingController {
-        /**
-         * Called inside ScrimView#OnDraw
-         */
-        void drawOnScrimWithScale(Canvas canvas, float scale);
+
+        /** Draw scrim view on canvas with scale. */
+        default void drawOnScrimWithScale(Canvas canvas, float scale) {
+            drawOnScrimWithScaleAndBottomOffset(canvas, scale, 0);
+        }
+
+        /** Draw scrim view on canvas with bottomOffset. */
+        default void drawOnScrimWithBottomOffset(Canvas canvas, @Px int bottomOffsetPx) {
+            drawOnScrimWithScaleAndBottomOffset(canvas, 1f, bottomOffsetPx);
+        }
+
+        /** Draw scrim view on canvas with scale and bottomOffset. */
+        void drawOnScrimWithScaleAndBottomOffset(
+                Canvas canvas, float scale, @Px int bottomOffsetPx);
     }
 }