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
Assert.isTrue(text != null && (value instanceof String));
	text.removeModifyListener(getModifyListener());
	text.setText((String) value);
	text.addModifyListener(getModifyListener());
}
/**
 * Processes a modify event that occurred in this text cell editor.
 * This framework method performs validation and sets the error message
 * accordingly, and then reports a change via <code>fireEditorValueChanged</code>.
 * Subclasses should call this method at appropriate times. Subclasses
 * may extend or reimplement.
 *
 * @param e the SWT modify event
 */
protected void editOccured(ModifyEvent e) {
	String value = text.getText();
	if (value == null)
		value = "";
	Object typedValue = value;
	boolean oldValidState = isValueValid();
	boolean newValidState = isCorrect(typedValue);
	if (typedValue == null && newValidState)
		Assert.isTrue(false, "Validator isn't limiting the cell editor's type range");
	if (!newValidState) {
		
		setErrorMessage(MessageFormat.format(getErrorMessage(), new Object[] {value}));
	}
	valueChanged(oldValidState, newValidState);
}
/**