Resolves: tdf#129346 if nothing currently selected, select something

in the slidesorter

Change-Id: I66853ba56eab93dfb18de7496212eb64e97cd2bf
Reviewed-on: https://gerrit.libreoffice.org/85109
Tested-by: Jenkins
Reviewed-by: Xisco Faulí <xiscofauli@libreoffice.org>
diff --git a/sd/source/ui/slidesorter/controller/SlsSelectionObserver.cxx b/sd/source/ui/slidesorter/controller/SlsSelectionObserver.cxx
index 0d4b23ff..bacf5fdf 100644
--- a/sd/source/ui/slidesorter/controller/SlsSelectionObserver.cxx
+++ b/sd/source/ui/slidesorter/controller/SlsSelectionObserver.cxx
@@ -112,7 +112,7 @@ void SelectionObserver::EndObservation()
    PageSelector& rSelector (mrSlideSorter.GetController().GetPageSelector());
    PageSelector::UpdateLock aUpdateLock (mrSlideSorter);
    rSelector.DeselectAllPages();
    if ( ! maInsertedPages.empty())
    if (!maInsertedPages.empty())
    {
        // Select the inserted pages.
        for (const auto& rpPage : maInsertedPages)
@@ -121,6 +121,12 @@ void SelectionObserver::EndObservation()
        }
        maInsertedPages.clear();
    }
    else
    {
        // tdf#129346 nothing currently selected, select something, if possible
        if (rSelector.GetPageCount())
            rSelector.SelectPage(0);
    }

    aUpdateLock.Release();
    mrSlideSorter.GetController().GetFocusManager().SetFocusedPageToCurrentPage();