[AppBarLayout] Fix snap issue with transparent status bar

Resolves #2387

GIT_ORIGIN_REV_ID=47538c3b4cb10337c537d1ef532bd1d73b216ae3
PiperOrigin-RevId: 406835368

Author: Khang-NT

lib/java/com/google/android/material/appbar/AppBarLayout.java

@@ -1526,10 +1526,11 @@ public void onAnimationUpdate(@NonNull ValueAnimator animator) {
     }
 
     private int getChildIndexOnOffset(@NonNull T abl, final int offset) {
+      final int ablTopInset = abl.getTopInset() + abl.getPaddingTop();
       for (int i = 0, count = abl.getChildCount(); i < count; i++) {
         View child = abl.getChildAt(i);
-        int top = child.getTop();
-        int bottom = child.getBottom();
+        int top = child.getTop() - ablTopInset;
+        int bottom = child.getBottom() - ablTopInset;
 
         final LayoutParams lp = (LayoutParams) child.getLayoutParams();
         if (checkFlag(lp.getScrollFlags(), LayoutParams.SCROLL_FLAG_SNAP_MARGINS)) {
@@ -1552,16 +1553,12 @@ private void snapToChildIfNeeded(CoordinatorLayout coordinatorLayout, @NonNull T
         final View offsetChild = abl.getChildAt(offsetChildIndex);
         final LayoutParams lp = (LayoutParams) offsetChild.getLayoutParams();
         final int flags = lp.getScrollFlags();
+        final int ablTopInset = abl.getTopInset() + abl.getPaddingTop();
 
         if ((flags & LayoutParams.FLAG_SNAP) == LayoutParams.FLAG_SNAP) {
           // We're set the snap, so animate the offset to the nearest edge
-          int snapTop = -offsetChild.getTop();
-          int snapBottom = -offsetChild.getBottom();
-
-          if (offsetChildIndex == abl.getChildCount() - 1) {
-            // If this is the last child, we need to take the top inset and padding into account
-            snapBottom += abl.getTopInset() + abl.getPaddingTop();
-          }
+          int snapTop = -offsetChild.getTop() + ablTopInset;
+          int snapBottom = -offsetChild.getBottom() + ablTopInset;
 
           if (checkFlag(flags, LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED)) {
             // If the view is set only exit until it is collapsed, we'll abide by that