tdf#136737 grid in change icon dialog ends up oversized

Change-Id: Ib3d28fc967bf5e1b95d71ebe42e1fc540ea91ac3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/102927
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/svtools/source/control/valueset.cxx b/svtools/source/control/valueset.cxx
index dde904d..4070630 100644
--- a/svtools/source/control/valueset.cxx
+++ b/svtools/source/control/valueset.cxx
@@ -541,6 +541,8 @@ void ValueSet::RemoveItem( sal_uInt16 nItemId )

void ValueSet::TurnOffScrollBar()
{
    if (mxScrolledWindow->get_vpolicy() == VclPolicyType::NEVER)
        return;
    mxScrolledWindow->set_vpolicy(VclPolicyType::NEVER);
    weld::DrawingArea* pDrawingArea = GetDrawingArea();
    Size aPrefSize(pDrawingArea->get_preferred_size());
@@ -549,6 +551,8 @@ void ValueSet::TurnOffScrollBar()

void ValueSet::TurnOnScrollBar()
{
    if (mxScrolledWindow->get_vpolicy() == VclPolicyType::ALWAYS)
        return;
    mxScrolledWindow->set_vpolicy(VclPolicyType::ALWAYS);
    weld::DrawingArea* pDrawingArea = GetDrawingArea();
    Size aPrefSize(pDrawingArea->get_preferred_size());