tdf#147723 sw_fieldmarkhide: fix crash when copying multiple fieldmarks

The problem is the UpdateFramesForAddDeleteRedline() call in makeMark(),
this is called in a loop for multiple fieldmarks and when it's called
for the first one, of course the other ones aren't in the document yet,
so HideIterator::Next() can't find them.

But this is only needed when inserting a new fieldmark anyway, so just
disable for copying.

(regression from commit 92384a8131)

Change-Id: Ic1b34d469a553cf7bbf2d1a99edaea900bdd7417
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/133215
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

sw/source/core/doc/docbm.cxx

@@ -683,8 +683,9 @@ namespace sw::mark
                 // no special array for these
                 break;
         }
-        if (eType == IDocumentMarkAccess::MarkType::TEXT_FIELDMARK
-            || eType == IDocumentMarkAccess::MarkType::DATE_FIELDMARK)
+        if (eMode == InsertMode::New
+            && (eType == IDocumentMarkAccess::MarkType::TEXT_FIELDMARK
+                || eType == IDocumentMarkAccess::MarkType::DATE_FIELDMARK))
         {
             // due to SwInsText notifications everything is visible now - tell
             // layout to hide as appropriate