Resolves: tdf#157587 IconView scoll range not updated

IconView::SetUpdateMode(true) doesn't update the scroll
range for any changes that might have taken place while
updates were suspended.

The similar SvImpLBox::UpdateAll() for "normal" lists
does this update, so do the equivalent update here too.

Noticeable since:

commit 666925f2ab06e690c41c470713dc83f2d752bfb7
Date:   Sat Jun 3 15:23:15 2023 +0100

    perf: use freeze/thaw around block insert of multiple icons

Change-Id: I318fc4509c6906161eabf3b312f311cb97ac063a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/165584
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>
diff --git a/vcl/source/treelist/iconviewimpl.cxx b/vcl/source/treelist/iconviewimpl.cxx
index 048e193..35025d1 100644
--- a/vcl/source/treelist/iconviewimpl.cxx
+++ b/vcl/source/treelist/iconviewimpl.cxx
@@ -467,6 +467,7 @@ void IconViewImpl::SyncVerThumb()
void IconViewImpl::UpdateAll()
{
    FindMostRight();
    AdjustScrollBars(m_aOutputSize);
    SyncVerThumb();
    FillView();
    ShowVerSBar();