[Carousel] Fixed focus order when using keyboard navigation for hero carousels.

When using the keybaord to move between items, FocusFinder would occasionally skip an item because it was using the unmasked bounds of each item to compare their distance.

PiperOrigin-RevId: 572025177

Author: hunterstich

lib/java/com/google/android/material/carousel/MaskableFrameLayout.java

@@ -19,6 +19,7 @@
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.graphics.Canvas;
+import android.graphics.Rect;
 import android.graphics.RectF;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
@@ -72,6 +73,11 @@ protected void onSizeChanged(int w, int h, int oldw, int oldh) {
     }
   }
 
+  @Override
+  public void getFocusedRect(Rect r) {
+    r.set((int) maskRect.left, (int) maskRect.top, (int) maskRect.right, (int) maskRect.bottom);
+  }
+
   @Override
   protected void onAttachedToWindow() {
     super.onAttachedToWindow();
@@ -133,10 +139,10 @@ public void setMaskXPercentage(float percentage) {
 
   private void updateMaskRectForMaskXPercentage() {
     if (maskXPercentage != NOT_SET) {
-    // Translate the percentage into an actual pixel value of how much of this view should be
-    // masked away.
-    float maskWidth = AnimationUtils.lerp(0f, getWidth() / 2F, 0f, 1f, maskXPercentage);
-    setMaskRectF(new RectF(maskWidth, 0F, (getWidth() - maskWidth), getHeight()));
+      // Translate the percentage into an actual pixel value of how much of this view should be
+      // masked away.
+      float maskWidth = AnimationUtils.lerp(0f, getWidth() / 2F, 0f, 1f, maskXPercentage);
+      setMaskRectF(new RectF(maskWidth, 0F, (getWidth() - maskWidth), getHeight()));
     }
   }