DOCX import: handle <w:alias> for the date SDT

Change-Id: I4a58fd9fc1db4e0fd3f9e2142fc208cec9f99f9d

writerfilter/source/dmapper/SdtHelper.cxx

@@ -128,6 +128,8 @@ void SdtHelper::createDateControl(OUString& rContentText, beans::PropertyValue a
     aGrabBag["DateFormat"] <<= sDateFormat;
     aGrabBag["Locale"] <<= m_sLocale.makeStringAndClear();
     aGrabBag["CharFormat"] <<= aCharFormat.Value;
+    // merge in properties like ooxml:CT_SdtPr_alias and friends.
+    aGrabBag.update(comphelper::SequenceAsHashMap(m_aGrabBag));
 
     std::vector<OUString> aItems;
     createControlShape(lcl_getOptimalWidth(m_rDM_Impl.GetStyleSheetTable(), rContentText, aItems), xControlModel, aGrabBag.getAsConstPropertyValueList());