tdf#147740 fix disappearing icons in groupbar

Change-Id: Ia67b90d05bccbd4d2c2553109ea7372574ee21d8
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/146584
Tested-by: Jenkins
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>
diff --git a/vcl/source/control/PriorityMergedHBox.cxx b/vcl/source/control/PriorityMergedHBox.cxx
index 75a26da..65d51cc 100644
--- a/vcl/source/control/PriorityMergedHBox.cxx
+++ b/vcl/source/control/PriorityMergedHBox.cxx
@@ -155,6 +155,15 @@ Size PriorityMergedHBox::calculateRequisition() const
        accumulateMaxes(aChildSize, aSize);
    }

    // find max height
    for (vcl::Window* pChild = GetWindow(GetWindowType::FirstChild); pChild;
         pChild = pChild->GetWindow(GetWindowType::Next))
    {
        Size aChildSize = getLayoutRequisition(*pChild);
        setPrimaryDimension(aChildSize, getPrimaryDimension(aSize));
        accumulateMaxes(aChildSize, aSize);
    }

    setPrimaryDimension(aSize, 200);
    return finalizeMaxes(aSize, nVisibleChildren);
}