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<p>This changeset refactors the #removeClass logic (which has been upgraded by Marcel recently) and extracts it to SystemNavigation, analogously to <span>System-ct.1221. It also refines the dialog to search for senders and subclasses of the class to remove
as we know it from #removeMessage.</span></p>
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<p><span><img size="23381" contenttype="image/png" id="img133219" style="max-width: 99.9%; user-select: none;" contextid="img720973" tabindex="0" src="cid:21b5558d-d73d-4d2c-bcc4-eeb40f7dee49"><br>
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<p><span>Please merge or give me feedback for improvements. :-)</span></p>
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<p><span>Best,</span></p>
<p><span>Christoph</span></p>
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