diff --git a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/.ratings b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/.ratings
index d12fd5381fd0dc307f1640c8308146aceb9e0dfb..88ca6cfa2881a32da2924312dccdb6536a3f0b52 100644
--- a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/.ratings
+++ b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/.ratings
@@ -1,6 +1,6 @@
 AdvancedTreeViewerEditorBase.java 9d9eded6848ee78991d1416592d1136efd71d2b7 GREEN
 AllocationDiagramEditorBase.java fa544546f73eea1150d90b7257b0e6bce82c288c GREEN
-CommonDiagramEditorBase.java 67496a1bb97ba03c40d19409e02866fe8df1adf1 YELLOW
+CommonDiagramEditorBase.java bcb3cafd8320197e7c78b772f1d0025330df4379 YELLOW
 ConstraintBasedProcessEditor.java 155a5a7ac41c668ae7ef978e8be13b83f5abd67d GREEN
 ConstraintBasedProcessEditorHelper.java 11d48e8a2aecd48eea259a42ef1192c4b292a334 GREEN
 DiagramEditorBase.java 09663ce095074d1a8eef086284eea0a7776e0431 GREEN
diff --git a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/CommonDiagramEditorBase.java b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/CommonDiagramEditorBase.java
index 67496a1bb97ba03c40d19409e02866fe8df1adf1..bcb3cafd8320197e7c78b772f1d0025330df4379 100644
--- a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/CommonDiagramEditorBase.java
+++ b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/CommonDiagramEditorBase.java
@@ -86,7 +86,6 @@ import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Menu;
-import org.eclipse.ui.IActionBars;
 import org.eclipse.ui.IEditorInput;
 import org.eclipse.ui.IEditorSite;
 import org.eclipse.ui.ISelectionListener;
@@ -410,7 +409,6 @@ abstract class CommonDiagramEditorBase<T extends EObject> extends GEFEditorBase<
 			zoomManager.setZoomLevelContributions(getZoomLevelContributions());
 			registerZoomAction();
 		}
-		zoomContribution = new ZoomComboContributionItemFixed(getSite().getPage());
 	}
 
 	/** Registers and returns the id of the given action. */
@@ -471,18 +469,6 @@ abstract class CommonDiagramEditorBase<T extends EObject> extends GEFEditorBase<
 	private static final List<String> defaultZoomLevelContribution =
 			Arrays.asList(new String[] {FIT_ALL, FIT_WIDTH, FIT_HEIGHT});
 
-	/** Registers global actions (including zoom action). */
-	@Override
-	public void registerGlobalActions(IActionBars bars) {
-		bars.getToolBarManager().add(zoomContribution);
-	}
-
-	/** Unregisters global actions (including zoom action). */
-	@Override
-	public void unregisterGlobalActions(IActionBars bars) {
-		bars.getToolBarManager().remove(zoomContribution);
-	}
-
 	/**
 	 * Registers the select all action. Sub-classes may override to prevent the
 	 * action registering.
diff --git a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/ZoomComboContributionItemFixed.java b/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/ZoomComboContributionItemFixed.java
deleted file mode 100644
index 274593bfb24461c39e70e048de6242e8a1660265..0000000000000000000000000000000000000000
--- a/org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/ZoomComboContributionItemFixed.java
+++ /dev/null
@@ -1,53 +0,0 @@
-/*-------------------------------------------------------------------------+
-| Copyright 2019 fortiss GmbH                                              |
-|                                                                          |
-| Licensed under the Apache License, Version 2.0 (the "License");          |
-| you may not use this file except in compliance with the License.         |
-| You may obtain a copy of the License at                                  |
-|                                                                          |
-|    http://www.apache.org/licenses/LICENSE-2.0                            |
-|                                                                          |
-| Unless required by applicable law or agreed to in writing, software      |
-| distributed under the License is distributed on an "AS IS" BASIS,        |
-| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
-| See the License for the specific language governing permissions and      |
-| limitations under the License.                                           |
-+--------------------------------------------------------------------------*/
-package org.fortiss.tooling.base.ui.editor;
-
-import org.eclipse.gef.ui.actions.ZoomComboContributionItem;
-import org.eclipse.swt.SWT;
-import org.eclipse.swt.widgets.Composite;
-import org.eclipse.swt.widgets.Control;
-import org.eclipse.ui.IPartService;
-
-/**
- * Overwrites {@link ZoomComboContributionItem} to fix the height adjustment of the zoom combo box.
- * 
- * @author diewald
- */
-public class ZoomComboContributionItemFixed extends ZoomComboContributionItem {
-
-	/** See {@link ZoomComboContributionItem#ZoomComboContributionItem(IPartService)}. */
-	public ZoomComboContributionItemFixed(IPartService partService) {
-		super(partService);
-	}
-
-	/** See {@link ZoomComboContributionItem#ZoomComboContributionItem(IPartService, String)}. */
-	public ZoomComboContributionItemFixed(IPartService partService, String initString) {
-		super(partService, initString);
-	}
-
-	/** See {@link ZoomComboContributionItem#ZoomComboContributionItem(IPartService, String[])}. */
-	public ZoomComboContributionItemFixed(IPartService partService, String[] initStrings) {
-		super(partService, initStrings);
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	protected Control createControl(Composite parent) {
-		Control control = super.createControl(parent);
-		parent.setSize(control.computeSize(SWT.DEFAULT, SWT.DEFAULT));
-		return control;
-	}
-}