Bug 270092 [CellEditors] [cell editors] TextCellEditor should not specify minimum size
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TextCellEditor.java
public void performPaste() {
        text.paste();
        checkSelection();
        checkDeleteable();
        checkSelectable();
    }
    /**
     * The <code>TextCellEditor</code> implementation of this
     * <code>CellEditor</code> method selects all of the
     * current text. 
     */
    public void performSelectAll() {
        text.selectAll();
        checkSelection();
        checkDeleteable();
    }
    /**
	 * This implementation of
	 * {@link CellEditor#dependsOnExternalFocusListener()} returns false if the
	 * current instance's class is TextCellEditor, and true otherwise.
	 * Subclasses that hook their own focus listener should override this method
	 * and return false. See also bug 58777.
	 * 
	 * @since 3.4
	 */
	protected boolean dependsOnExternalFocusListener() {
		return getClass() != TextCellEditor.class;
	}
}