[Bottom Sheet] Prevents nested scroll from occurring in a scroll session when the bottom sheet is already being resized.

Previously, the bottom sheet could be fixed at any height while resizing it by triggering a fling in the opposite direction.

PiperOrigin-RevId: 628170687

Author: Material Design Team

lib/java/com/google/android/material/bottomsheet/BottomSheetBehavior.java

@@ -748,7 +748,10 @@ public void onNestedPreScroll(
     int currentTop = child.getTop();
     int newTop = currentTop - dy;
     if (dy > 0) { // Upward swipe
-      if (!draggableOnNestedScroll && target == scrollingChild && target.canScrollVertically(1)) {
+      if (!nestedScrolled
+          && !draggableOnNestedScroll
+          && target == scrollingChild
+          && target.canScrollVertically(1)) {
         // Prevent dragging if draggableOnNestedScroll=false and we can scroll the scrolling child.
         draggableOnNestedScrollLastDragIgnored = true;
         return;
@@ -769,7 +772,7 @@ public void onNestedPreScroll(
       }
     } else if (dy < 0) { // Downward swipe
       boolean canScrollUp = target.canScrollVertically(-1);
-      if (!draggableOnNestedScroll && target == scrollingChild && canScrollUp) {
+      if (!nestedScrolled && !draggableOnNestedScroll && target == scrollingChild && canScrollUp) {
         // Prevent dragging if draggableOnNestedScroll=false and we can scroll the scrolling child.
         draggableOnNestedScrollLastDragIgnored = true;
         return;