~SwModify: do not silently tolerate clients registered past death

- Make SwFormat/SwContentNode explicitly resetting the page desc. before
  death instead of SwFormatPageDesc trying to do that on the dying hint:
  * the dying hints is send _after_ the SwFormat/SwContentNode dtor are
    completed, so the RTTI magic did not work anyway
  * simply resetting the attribute in a final dtor and make
    SwFormatPageDesc just check to never get a dying hint (because it
    should have been destructed by reset) is a lot less errorprone.

Change-Id: I231f1729729491ba7544e5ba93d81192b212e2ae
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108648
Tested-by: Jenkins
Reviewed-by: Bjoern Michaelsen <bjoern.michaelsen@libreoffice.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/sw/source/core/attr/format.cxx b/sw/source/core/attr/format.cxx
index 4b0529d2f253..1f83d913be38 100644
--- a/sw/source/core/attr/format.cxx
+++ b/sw/source/core/attr/format.cxx
@@ -219,9 +219,10 @@ SwFormat::~SwFormat()
         return;
 
     m_bFormatInDTOR = true;
-
+    
     if(!DerivedFrom())
     {
+        SwFormat::ResetFormatAttr(RES_PAGEDESC);
         SAL_WARN("sw.core", "~SwFormat: format still has clients on death, but parent format is missing: " << GetName());
         return;
     }