tdf#115853: save current custom property when adding line

by reloading current lines before adding a brand new one
indeed the info are deleted by ClearCustomProperties
each time SfxDocumentInfoItem destructor is called

Change-Id: Id1e2e652e90c720f00b8612aa9afbfa91b784d1d
Reviewed-on: https://gerrit.libreoffice.org/50070Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Reviewed-on: https://gerrit.libreoffice.org/52349Reviewed-by: Jean-Baptiste Faure <jbfaure@libreoffice.org>
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
(cherry picked from commit c522b401)
(cherry picked from commit 4e82bfb2)

sfx2/source/dialog/dinfdlg.cxx

@@ -2118,6 +2118,20 @@ void SfxCustomPropertiesPage::dispose()
 
 IMPL_LINK_NOARG(SfxCustomPropertiesPage, AddHdl, Button*, void)
 {
+    // tdf#115853: reload current lines before adding a brand new one
+    // indeed the info are deleted by ClearCustomProperties
+    // each time SfxDocumentInfoItem destructor is called
+    SfxDocumentInfoItem pInfo;
+    Sequence< beans::PropertyValue > aPropertySeq = m_pPropertiesCtrl->GetCustomProperties();
+    sal_Int32 i = 0, nCount = aPropertySeq.getLength();
+    for ( ; i < nCount; ++i )
+    {
+        if ( !aPropertySeq[i].Name.isEmpty() )
+        {
+            pInfo.AddCustomProperty( aPropertySeq[i].Name, aPropertySeq[i].Value );
+        }
+    }
+
     Any aAny;
     m_pPropertiesCtrl->AddLine( OUString(), aAny, true );
 }