tdf#132740 don't broadcast if modified status has not changed

take 10% of the time off

Change-Id: I75c8d5e1297de342df711d15260073db59946116
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/118531
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
diff --git a/editeng/source/editeng/editdoc.cxx b/editeng/source/editeng/editdoc.cxx
index 99a7e22..adaff88 100644
--- a/editeng/source/editeng/editdoc.cxx
+++ b/editeng/source/editeng/editdoc.cxx
@@ -2199,6 +2199,8 @@ void EditDoc::ClearSpellErrors()

void EditDoc::SetModified( bool b )
{
    if (bModified == b)
        return;
    bModified = b;
    if ( bModified )
    {