tdf#136481 show the focus rect for the case nothing is yet selected

but the cursor is at pos 0

Change-Id: I7c94480bffdced23fe89d4e3ba0e729742247130
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/128414
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/sc/source/ui/view/gridwin.cxx b/sc/source/ui/view/gridwin.cxx
index b03c094..543a60a 100644
--- a/sc/source/ui/view/gridwin.cxx
+++ b/sc/source/ui/view/gridwin.cxx
@@ -1481,12 +1481,16 @@ void ScGridWindow::LaunchDataSelectMenu( SCCOL nCol, SCROW nRow )
    {
        rFilterBox.grab_focus();

        if (rFilterBox.n_children())
        {
            if (nSelPos != -1)
                rFilterBox.set_cursor(nSelPos);
            else
                rFilterBox.set_cursor(0);
        }
        // Select only after GrabFocus, so that the focus rectangle gets correct
        if (nSelPos != -1)
        {
            rFilterBox.set_cursor(nSelPos);
            rFilterBox.select(nSelPos);
        }
        else
            rFilterBox.unselect_all();