Tweak numbering listbox optimal size

Change-Id: I7dedd5bc405da04a14bc7d74475c85a90e989e9c
Reviewed-on: https://gerrit.libreoffice.org/28021Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
Tested-by: Katarina Behrens <Katarina.Behrens@cib.de>

include/svx/pagenumberlistbox.hxx

@@ -30,6 +30,8 @@ public:
 
     void SetSelection( sal_uInt16 );
     sal_uInt16 GetSelection() const;
+
+    Size GetOptimalSize() const override;
 };
 
 #endif

svx/source/dialog/pagenumberlistbox.cxx

@@ -66,4 +66,9 @@ sal_uInt16 PageNumberListBox::GetSelection() const
     return nData;
 }
 
+Size PageNumberListBox::GetOptimalSize() const
+{
+    return Size(150, ListBox::GetOptimalSize().Height());
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */