move dots of long filenames into the middle, so the end is visible

app/src/main/res/layout/item_file_dir_list.xml

@@ -30,7 +30,7 @@
             android:id="@+id/item_name"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
-            android:ellipsize="end"
+            android:ellipsize="middle"
             android:maxLines="1"
             android:paddingStart="@dimen/tiny_margin"
             android:textSize="@dimen/normal_text_size"