Steps to Reproduce

static case:

<zk>
    <ckeditor/>
</zk>

dynamic case:

<zk>
    <zscript><![CDATA[import org.zkforge.ckez.CKeditor;]]></zscript>
    <div>
        <button label="attach ckeditor" onClick="self.getParent().appendChild(new CKeditor())"/> ckeditor causes vertical scrollbar
        <separator/>
        <button label="detach ckeditor" onClick="self.getNextSibling().detach();"/>
    </div>
</zk>

Current Result

a ckeditor causes a vertical scrollbar for just one additional pixel

even after detaching the ckeditor widget the scrollbar remains (-> the hidden div doesn't get cleaned up)

Expected Result

no scrollbar

cleanup after detaching ckeditor

Debug Information

the scrollbar is caused by a hidden div created by the copyformatting plugin

Workaround

assign a bottom 0px to remove the hidden div from the page flow

.cke_screen_reader_only {
    bottom: 0px;
}