(related: tdf#130685) sw_redlinehide: fix update of pLastNode/pParaPropsNode

If you Select All, Cut then move the cursor around a bit then paste, then this happens:

sw/source/core/text/txtfrm.cxx:3461: void SwTextFrame::CalcAdditionalFirstLineOffset(): Assertion `pTextNode->IsNumbered(getRootFrame()) == pTextNode->IsNumbered(nullptr)' failed.

The reason is this borked MergedPara, which really only has 1 node it's listening on, but pLastNode and pParaPropsNode point to a node that is actually part of a different MergedPara now.

$6 = {
  listener = {
    m_rToTell = @0x6c02700,
    m_vDepends = std::__debug::vector of length 1, capacity 256 = {{
        <SwClient> = {
          m_pRegisteredIn = 0x6af5f20
        },
      }}
  },
  extents = std::__debug::vector of length 0, capacity 0,
  mergedText = "",
  pParaPropsNode = 0x6d1c390,
  pFirstNode = 0x6af5f20,
  pLastNode = 0x6d1c390
}

The reason is that SwContentNode::DelFrames() doesn't update these members properly; at the time when it's called for the previous pLastNode, the offending node has Merge::NonFirst set already in the call of CheckParaRedlineMerge() so it sets the wrong new pLastNode.

Fix this by iterating DelFrames() loop backward.

(regression from sw_redlinehide)

Change-Id: I508fd25af385a25ba9ed78d71aa3d1f02a7ac7a3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/91597
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@cib.de>

2 files changed, 4 insertions, 1 deletions

diff --git a/sw/source/core/docnode/node.cxx b/sw/source/core/docnode/node.cxx
index eacf62d4c56f..5c5b648f7cb5 100644
--- a/sw/source/core/docnode/node.cxx
+++ b/sw/source/core/docnode/node.cxx
@@ -1386,6 +1386,7 @@ void SwContentNode::DelFrames(SwRootFrame const*const pLayout)
                                 break;
                             }
                         }
+                        assert(pMerged->listener.IsListeningTo(pMerged->pParaPropsNode));
                     }
                     assert(GetIndex() <= pMerged->pLastNode->GetIndex());
                     if (this == pMerged->pLastNode)
@@ -1407,6 +1408,7 @@ void SwContentNode::DelFrames(SwRootFrame const*const pLayout)
                             }
                         }
                         assert(pMerged->pFirstNode->GetIndex() <= pMerged->pLastNode->GetIndex());
+                        assert(pMerged->listener.IsListeningTo(pMerged->pLastNode));
                     }
                     // avoid re-parenting mess (ModifyChangedHint)
                     pMerged->listener.EndListening(this);
diff --git a/sw/source/core/text/redlnitr.cxx b/sw/source/core/text/redlnitr.cxx
index 53f614d84b68..d4be4a1d3d8d 100644
--- a/sw/source/core/text/redlnitr.cxx
+++ b/sw/source/core/text/redlnitr.cxx
@@ -276,7 +276,8 @@ CheckParaRedlineMerge(SwTextFrame & rFrame, SwTextNode & rTextNode,
         }
         // unfortunately DelFrames() must be done before StartListening too,
         // otherwise footnotes cannot be deleted by SwTextFootnote::DelFrames!
-        for (auto iter = ++nodes.begin(); iter != nodes.end(); ++iter)
+        auto const end(--nodes.rend());
+        for (auto iter = nodes.rbegin(); iter != end; ++iter)
         {
             (**iter).DelFrames(rFrame.getRootFrame());
         }