[Divider] Fixed extra space when lastItemDecorated = false

Resolves #2511

PiperOrigin-RevId: 444556765

Author: Material Design Team

lib/java/com/google/android/material/divider/MaterialDividerItemDecoration.java

@@ -371,10 +371,12 @@ public void getItemOffsets(
       @NonNull RecyclerView parent,
       @NonNull RecyclerView.State state) {
     outRect.set(0, 0, 0, 0);
-    if (orientation == VERTICAL) {
-      outRect.bottom = dividerDrawable.getIntrinsicHeight() + thickness;
-    } else {
-      outRect.right = dividerDrawable.getIntrinsicWidth() + thickness;
+    if (lastItemDecorated || parent.getChildLayoutPosition(view) != state.getItemCount() - 1) {
+      if (orientation == VERTICAL) {
+        outRect.bottom = dividerDrawable.getIntrinsicHeight() + thickness;
+      } else {
+        outRect.right = dividerDrawable.getIntrinsicWidth() + thickness;
+      }
     }
   }
 }

lib/javatests/com/google/android/material/divider/MaterialDividerItemDecorationTest.java

@@ -24,6 +24,7 @@
 import android.graphics.Color;
 import android.graphics.Rect;
 import androidx.recyclerview.widget.RecyclerView;
+import android.view.View;
 import android.widget.LinearLayout;
 import androidx.test.core.app.ApplicationProvider;
 import org.junit.Before;
@@ -46,6 +47,7 @@ public final class MaterialDividerItemDecorationTest {
   private final Context context = ApplicationProvider.getApplicationContext();
 
   @Mock private RecyclerView.State state;
+  @Mock private View view;
   @Mock private RecyclerView recyclerView;
   private Rect rect;
   private MaterialDividerItemDecoration divider;
@@ -141,7 +143,7 @@ public void setLastItemNotDecorated_succeeds() {
 
   @Test
   public void getItemOffsets_verticalOrientation_returnsCorrectRect() {
-    divider.getItemOffsets(rect, /* view= */ null, recyclerView, state);
+    divider.getItemOffsets(rect, view, recyclerView, state);
 
     assertThat(rect).isEqualTo(new Rect(0, 0, 0, DIVIDER_THICKNESS));
   }
@@ -150,7 +152,7 @@ public void getItemOffsets_verticalOrientation_returnsCorrectRect() {
   public void getItemOffsets_horizontalOrientation_returnsCorrectRect() {
     divider.setOrientation(LinearLayout.HORIZONTAL);
 
-    divider.getItemOffsets(rect, /* view= */ null, recyclerView, state);
+    divider.getItemOffsets(rect, view, recyclerView, state);
 
     assertThat(rect).isEqualTo(new Rect(0, 0, DIVIDER_THICKNESS, 0));
   }