[SearchView] Restore modal for accessibility and back handling state in onAttachedToWindow() and remove modal for accessibility state in onDetachedFromWindow()

Fixes an issue where nothing is focusable in TalkBack after removing SearchView, due to the modal for accessibility behavior

Resolves #4176

PiperOrigin-RevId: 644038017

Author: dsn5ft

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

@@ -263,12 +263,16 @@ protected void onAttachedToWindow() {
     super.onAttachedToWindow();
 
     MaterialShapeUtils.setParentAbsoluteElevation(this);
+    TransitionState state = getCurrentTransitionState();
+    updateModalForAccessibility(state);
+    updateListeningForBackCallbacks(state);
   }
 
   @Override
   protected void onDetachedFromWindow() {
     super.onDetachedFromWindow();
 
+    setModalForAccessibility(/* isSearchViewModal= */ false);
     backOrchestrator.stopListeningForBackCallbacks();
   }
 
@@ -810,11 +814,7 @@ private void setTransitionState(
     }
 
     if (updateModalForAccessibility) {
-      if (state == TransitionState.SHOWN) {
-        setModalForAccessibility(true);
-      } else if (state == TransitionState.HIDDEN) {
-        setModalForAccessibility(false);
-      }
+      updateModalForAccessibility(state);
     }
 
     TransitionState previousState = currentTransitionState;
@@ -827,6 +827,14 @@ private void setTransitionState(
     updateListeningForBackCallbacks(state);
   }
 
+  private void updateModalForAccessibility(@NonNull TransitionState state) {
+    if (state == TransitionState.SHOWN) {
+      setModalForAccessibility(true);
+    } else if (state == TransitionState.HIDDEN) {
+      setModalForAccessibility(false);
+    }
+  }
+
   private void updateListeningForBackCallbacks(@NonNull TransitionState state) {
     // Only automatically handle back if we have a search bar to collapse to, and if back handling
     // is enabled for the SearchView.