refactor(DummyStatusDisplayItem.java): readd DummyStatusDisplayItem.java

mastodon/src/main/java/org/joinmastodon/android/ui/displayitems/DummyStatusDisplayItem.java

@@ -0,0 +1,42 @@
+package org.joinmastodon.android.ui.displayitems;
+
+import android.content.Context;
+import android.view.ViewGroup;
+import android.widget.Space;
+
+import androidx.recyclerview.widget.RecyclerView;
+
+import org.joinmastodon.android.fragments.BaseStatusListFragment;
+
+import me.grishka.appkit.utils.V;
+
+public class DummyStatusDisplayItem extends StatusDisplayItem {
+
+	public DummyStatusDisplayItem(String parentID, BaseStatusListFragment<?> parentFragment) {
+		super(parentID, parentFragment);
+	}
+
+	@Override
+	public Type getType() {
+		return Type.DUMMY;
+	}
+
+	public static class Holder extends StatusDisplayItem.Holder<DummyStatusDisplayItem> {
+		private final RecyclerView.LayoutParams params;
+
+		public Holder(Context context) {
+			super(new Space(context));
+			params=new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0);
+
+			// BetterItemAnimator appears not to handle InsetStatusItemDecoration's getItemOffsets
+			// correctly, causing removed inset views to jump while animating. i don't quite
+			// understand it, but this workaround appears to work.
+			// see InsetStatusItemDecoration#getItemOffsets
+			params.setMargins(0, 0, 0, V.dp(16));
+			itemView.setLayoutParams(params);
+		}
+
+		@Override
+		public void onBind(DummyStatusDisplayItem item) {}
+	}
+}