Hmm, of example in the

connect(gcodeEditor, &GCodeEditorWidget::updateClientFactory, this, [this](KTextEditor::View* view){

    guiFactory()->removeClient(m_currEditorView);
    guiFactory()->addClient(view);
    m_currEditorView = view;
});

part: could m_currEditorView be there null at the start or later? must one guard that?

Beside that, I am not sure how you handle view deletes, isn't the current view pointer then dangling?

In D12691#257999, @cullmann wrote:

Hmm, of example in the

connect(gcodeEditor, &GCodeEditorWidget::updateClientFactory, this, [this](KTextEditor::View* view){
        guiFactory()->removeClient(m_currEditorView);
        guiFactory()->addClient(view);
        m_currEditorView = view;
    });

part: could m_currEditorView be there null at the start or later? must one guard that?

I think this is the reason for the crash on close if more then two files are opened..