erase matching container if notebook page removed

Change-Id: I15c1bb40f301684e58adcf7d366d7fa1bd171b04
Reviewed-on: https://gerrit.libreoffice.org/82136
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/unx/gtk3/gtk3gtkinst.cxx b/vcl/unx/gtk3/gtk3gtkinst.cxx
index 584ffe3..d67eb85 100644
--- a/vcl/unx/gtk3/gtk3gtkinst.cxx
+++ b/vcl/unx/gtk3/gtk3gtkinst.cxx
@@ -5366,11 +5366,13 @@ private:
        return -1;
    }

    void remove_page(GtkNotebook *pNotebook, const OString& rIdent)
    int remove_page(GtkNotebook *pNotebook, const OString& rIdent)
    {
        disable_notify_events();
        gtk_notebook_remove_page(pNotebook, get_page_number(pNotebook, rIdent));
        int nPageNumber = get_page_number(pNotebook, rIdent);
        gtk_notebook_remove_page(pNotebook, nPageNumber);
        enable_notify_events();
        return nPageNumber;
    }

    static OUString get_tab_label_text(GtkNotebook *pNotebook, guint nPage)
@@ -5874,7 +5876,10 @@ public:
            unsplit_notebooks();
            reset_split_data();
        }
        remove_page(m_pNotebook, rIdent);

        unsigned int nPageIndex = remove_page(m_pNotebook, rIdent);
        if (nPageIndex < m_aPages.size())
            m_aPages.erase(m_aPages.begin() + nPageIndex);
    }

    virtual void append_page(const OString& rIdent, const OUString& rLabel) override