tdf#132911 sw_redlinehide: fix assert in CopyImplImpl()

With Ctrl+A, Ctrl+X, Ctrl+V we get the  bAfterTable = true case;
line 4722 does pCopyPam->GetPoint()->nNode-- and then line 5085 does
pCopyPam->GetPoint()->nNode++ but the problem is that nContent still
points to the same node as initially while the node after the table end
node is now a different one, i.e. nNode and nContent point to different
nodes and something in redlining asserts becuase of that with
"Assertion `m_pIndexReg == rIndex.m_pIndexReg' failed."; we don't get
to step 4 anyway.

(reportedly something changed with commit
4532845e22c10f252840887e55002307227b2390 but it's a mystery what that
would be)

Change-Id: I23744fad543e1e7bfcc11c4b488d4469ba9e509c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/99166
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@cib.de>
(cherry picked from commit 14bdbc36f0cf3913f6de10c746044b6aadf37095)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/99193
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
(cherry picked from commit 724d5240f69abc675397260fad359080766d0ec5)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/99197
Tested-by: Xisco Fauli <xiscofauli@libreoffice.org>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
diff --git a/sw/source/core/doc/DocumentContentOperationsManager.cxx b/sw/source/core/doc/DocumentContentOperationsManager.cxx
index 67bda981..4db8ad5 100644
--- a/sw/source/core/doc/DocumentContentOperationsManager.cxx
+++ b/sw/source/core/doc/DocumentContentOperationsManager.cxx
@@ -5078,10 +5078,10 @@ bool DocumentContentOperationsManager::CopyImplImpl(SwPaM& rPam, SwPosition& rPo
        pCopyPam->Move( fnMoveForward, bCanMoveBack ? GoInContent : GoInNode );
    else
    {
        // Reset the offset to 0 as it was before the insertion
        pCopyPam->GetPoint()->nContent = 0;

        pCopyPam->GetPoint()->nNode++;

        // Reset the offset to 0 as it was before the insertion
        pCopyPam->GetPoint()->nContent.Assign(pCopyPam->GetPoint()->nNode.GetNode().GetContentNode(), 0);
        // If the next node is a start node, then step back: the start node
        // has been copied and needs to be in the selection for the undo
        if (pCopyPam->GetPoint()->nNode.GetNode().IsStartNode())