Resolves: tdf#110429 width of page number wider than traditional width

since...

commit c80ac2ba
Date:   Fri Nov 11 18:16:52 2016 +0100

    Avoid -fsanitize=signed-integer-overflow

Change-Id: I2ec85e854ee1547d55b43b8540c357297d3b6cce
Reviewed-on: https://gerrit.libreoffice.org/67068
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/source/uibase/utlui/navipi.cxx

@@ -648,7 +648,7 @@ SwNavigationPI::SwNavigationPI(SfxBindings* _pBindings,
     tools::Rectangle aSecondRect = m_aContentToolBox->GetItemRect(m_aContentToolBox->GetItemId("header"));
     Size aItemWinSize( aFirstRect.Left() - aSecondRect.Left(),
                        aFirstRect.Bottom() - aFirstRect.Top() );
-    Size aOptimalSize(m_xEdit->get_preferred_size());
+    Size aOptimalSize(m_xEdit->CalcMinimumSizeForText(m_xEdit->CreateFieldText(9999)));
     aItemWinSize.setWidth( std::max(aItemWinSize.Width(), aOptimalSize.Width()) );
     m_xEdit->SetSizePixel(aItemWinSize);
     m_aContentToolBox->InsertSeparator(4);