tdf#69416 don't remove field content in proofreading,

only the requested footnote numbers, allowing grammar
checking of automatic references with affixes, articles etc.

Expanded fields get also a starting ZWSP character
for more precise grammar checking.

(Partial revert of commit d477ff4a)

Change-Id: I78ab02cc8cf98d665e7f9ddc740879c203f2f7e4
Reviewed-on: https://gerrit.libreoffice.org/51228Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: László Németh <nemeth@numbertext.org>

sw/source/core/txtnode/modeltoviewhelper.cxx

@@ -147,9 +147,10 @@ ModelToViewHelper::ModelToViewHelper(const SwTextNode &rNode, ExpandMode eMode)
                         case RES_TXTATR_ANNOTATION:
                             if (eMode & ExpandMode::ExpandFields)
                             {
-                                aFieldResult.m_sExpand = (eMode & ExpandMode::ReplaceMode)
-                                    ? OUString(CHAR_ZWSP)
-                                    : static_txtattr_cast<SwTextField const*>(pAttr)->
+                                // add a ZWSP before the expanded field in replace mode
+                                aFieldResult.m_sExpand = ((eMode & ExpandMode::ReplaceMode)
+                                    ? OUString(CHAR_ZWSP) : OUString("")) +
+                                      static_txtattr_cast<SwTextField const*>(pAttr)->
                                       GetFormatField().GetField()->ExpandField(true);
                                 aFieldResult.m_eType = FieldResult::FIELD;
                             }