Bug 12329 [Cell Editors] Request:ComboBoxCellEditor READ_ONLY style
Although CCombo accepts SWT.READ_ONLY style, there is no way to specify style when it is used in ComboBoxCellEditor. How about adding createControl(Composite parent, int style) method to ComboBoxCellEditor class?
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TextCellEditor.java
* Since a text editor field is scrollable we don't
 * set a minimumSize.
 */
public LayoutData getLayoutData() {
	return new LayoutData();
}
/**
 * Return the modify listener.
 */
private ModifyListener getModifyListener() {
	if (modifyListener == null) {
		modifyListener = new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				editOccured(e);
			}
		};
	}
	return modifyListener;
}
/**
 * The <code>TextCellEditor</code>  implementation of this 
 * <code>CellEditor</code> method returns <code>true</code> if 
 * the current selection is not empty.
 */
public boolean isCopyEnabled() {
	if (text == null || text.isDisposed())
		return false;
	return text.getSelectionCount() > 0;
}
/**