removed unnecessary marker interface.

src/main/java/com/weis/darklaf/components/tabframe/TabFrameContentPane.java

@@ -447,7 +447,7 @@ public class TabFrameContentPane extends JPanel implements TabFrameContent {
         }
     }
 
-    protected static class TabFrameSplitPane extends ToggleSplitPane implements TabFrameControl {
+    protected static class TabFrameSplitPane extends ToggleSplitPane {
         protected TabFrameSplitPane(final String name) {
             super(name);
         }

src/main/java/com/weis/darklaf/components/tabframe/TabFrameControl.java

@@ -1,27 +0,0 @@
-/*
- * MIT License
- *
- * Copyright (c) 2019 Jannis Weis
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-package com.weis.darklaf.components.tabframe;
-
-public interface TabFrameControl {
-}