Only use window insets for Snackbar (BaseTransientBottomBar) bottom margin if

anchor view is not provided

PiperOrigin-RevId: 230532747

Author: dsn5ft

lib/java/com/google/android/material/snackbar/BaseTransientBottomBar.java

@@ -366,8 +366,12 @@ private Drawable createThemedBackground() {
 
   private void updateBottomMargin() {
     MarginLayoutParams layoutParams = (MarginLayoutParams) view.getLayoutParams();
-    layoutParams.bottomMargin =
-        originalBottomMargin + extraBottomMarginInsets + extraBottomMarginAnchorView;
+    layoutParams.bottomMargin = originalBottomMargin;
+    if (anchorView != null) {
+      layoutParams.bottomMargin += extraBottomMarginAnchorView;
+    } else {
+      layoutParams.bottomMargin += extraBottomMarginInsets;
+    }
     view.setLayoutParams(layoutParams);
   }