Resolves: tdf#124975 toggle parent input blocked only in set_modal

since...

commit e54762baa8019d02cadd311e750f6ff0d276f67b
Author: Caolán McNamara <caolanm@redhat.com>
Date:   Tue Apr 16 17:17:58 2019 +0100

    weld ScTPValidationValue and ScValidationDlg

the inc/dev modality on show/hide isn't desirable anymore

Change-Id: I5bf908871986160de61508c9678495d0d5a8296d
Reviewed-on: https://gerrit.libreoffice.org/71426
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 2bb5a83..e2024dd 100644
--- a/vcl/unx/gtk3/gtk3gtkinst.cxx
+++ b/vcl/unx/gtk3/gtk3gtkinst.cxx
@@ -2975,32 +2975,12 @@ public:
        return GtkToVcl(ret);
    }

    virtual void hide() override
    {
        if (!gtk_widget_get_visible(m_pWidget))
            return;
        gtk_widget_hide(m_pWidget);
        // if we hide the dialog while its running, then decrement the parent LibreOffice window
        // modal count, we expect the dialog to restored while its running and match up with
        // the inc_modal_count of show()
        //
        // This hide while running case is for the calc/chart dialogs which put
        // up an extra range chooser dialog, hides the original, the user can
        // select a range of cells and on completion the original dialog is
        // restored
        if (m_aDialogRun.loop_is_running())
            m_aDialogRun.dec_modal_count();
    }

    virtual void show() override
    {
        if (gtk_widget_get_visible(m_pWidget))
            return;
        sort_native_button_order(GTK_BOX(gtk_dialog_get_action_area(m_pDialog)));
        gtk_widget_show(m_pWidget);
        // see hide comment
        if (m_aDialogRun.loop_is_running())
            m_aDialogRun.inc_modal_count();
    }

    virtual void set_modal(bool bModal) override
@@ -3008,8 +2988,17 @@ public:
        if (get_modal() == bModal)
            return;
        GtkInstanceWindow::set_modal(bModal);
        // see hide comment, but the modality-change example
        // is the validity dialog in calc
        /* if change the dialog modality while its running, then also change the parent LibreOffice window
           modal count, we typically expect the dialog modality to be restored to its original state

           This change modality while running case is for...

           a) the calc/chart dialogs which put up an extra range chooser
           dialog, hides the original, the user can select a range of cells and
           on completion the original dialog is restored

           b) the validity dialog in calc
        */
        if (m_aDialogRun.loop_is_running())
        {
            if (bModal)