[Predictive Back][Search] Fix issue on Android U where clicking SearchView back button causes SearchBar to disappear and back arrow animation to not run

PiperOrigin-RevId: 536876120

Author: dsn5ft

lib/java/com/google/android/material/motion/MaterialMainContainerBackHelper.java

@@ -92,17 +92,20 @@ public void startBackProgress(@NonNull BackEvent backEvent, @NonNull View collap
   @VisibleForTesting
   @RequiresApi(VERSION_CODES.UPSIDE_DOWN_CAKE)
   public void startBackProgress(float touchY, @NonNull View collapsedView) {
-    collapsedView.setVisibility(View.INVISIBLE);
-
     initialHideToClipBounds = ViewUtils.calculateRectFromBounds(view);
     initialHideFromClipBounds = ViewUtils.calculateOffsetRectFromBounds(view, collapsedView);
     initialTouchY = touchY;
   }
 
   @RequiresApi(VERSION_CODES.UPSIDE_DOWN_CAKE)
-  public void updateBackProgress(@NonNull BackEvent backEvent, float collapsedCornerSize) {
+  public void updateBackProgress(
+      @NonNull BackEvent backEvent, @NonNull View collapsedView, float collapsedCornerSize) {
     super.onUpdateBackProgress(backEvent);
 
+    if (collapsedView.getVisibility() != View.INVISIBLE) {
+      collapsedView.setVisibility(View.INVISIBLE);
+    }
+
     boolean leftSwipeEdge = backEvent.getSwipeEdge() == BackEvent.EDGE_LEFT;
     updateBackProgress(
         backEvent.getProgress(), leftSwipeEdge, backEvent.getTouchY(), collapsedCornerSize);

lib/java/com/google/android/material/search/SearchViewAnimationHelper.java

@@ -615,23 +615,27 @@ private void setMenuItemsNotClickable(Toolbar toolbar) {
   @RequiresApi(VERSION_CODES.UPSIDE_DOWN_CAKE)
   void startBackProgress(@NonNull BackEvent backEvent) {
     backHelper.startBackProgress(backEvent, searchBar);
-
-    if (searchView.isAdjustNothingSoftInputMode()) {
-      searchView.clearFocusAndHideKeyboard();
-    }
-
-    // Start and immediately pause the animator set so that we can seek it with setCurrentPlayTime()
-    // in updateBackProgress() when the progress value changes.
-    backProgressAnimatorSet = getButtonsProgressAnimator(/* show= */ false);
-    backProgressAnimatorSet.start();
-    backProgressAnimatorSet.pause();
   }
 
   @RequiresApi(VERSION_CODES.UPSIDE_DOWN_CAKE)
   public void updateBackProgress(@NonNull BackEvent backEvent) {
-    backHelper.updateBackProgress(backEvent, searchBar.getCornerSize());
+    if (backEvent.getProgress() <= 0f) {
+      return;
+    }
 
-    if (backProgressAnimatorSet != null) {
+    backHelper.updateBackProgress(backEvent, searchBar, searchBar.getCornerSize());
+
+    if (backProgressAnimatorSet == null) {
+      if (searchView.isAdjustNothingSoftInputMode()) {
+        searchView.clearFocusAndHideKeyboard();
+      }
+
+      // Start and immediately pause the animator set so we can seek it with setCurrentPlayTime() in
+      // subsequent updateBackProgress() calls when the progress value changes.
+      backProgressAnimatorSet = getButtonsProgressAnimator(/* show= */ false);
+      backProgressAnimatorSet.start();
+      backProgressAnimatorSet.pause();
+    } else {
       backProgressAnimatorSet.setCurrentPlayTime(
           (long) (backEvent.getProgress() * backProgressAnimatorSet.getDuration()));
     }