tdf#138253 sw textbox: fix content of draw format on undo

Regression from commit da4f9b77a6cd39b1ae5babdd476d1575c8b9371c
(tdf#135149 sw: fix deleting textbox of as-char shapes, 2020-09-07), the
crash was caused by a user-after-free triggered from the X11 clipboard
code. This could happen beause the clipboard document had a draw frame
format, which has an SwNode pointer, but the SwNode instance was outside
that clipboard document, and the owning document is already gone. So by
the time the clipboard document would be deleted, the SwNodeIndex can't
de-register itself.

The root cause was that the doc model was corrupted after a cut of a
textbox + undo: the textbox pointers of the fly/draw formats were OK,
but not the SwFormatContent of the draw format.

(cherry picked from commit 42e8e16cf93dcf944e5c1106f76aaa32057c0397)

Conflicts:
sw/source/core/layout/atrfrm.cxx

Change-Id: I5761b72948caca397320aed801559e8493c33e1b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/106539
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

3 files changed, 41 insertions, 0 deletions

diff --git a/sw/qa/core/undo/data/textbox-cut-undo.docx b/sw/qa/core/undo/data/textbox-cut-undo.docx
new file mode 100644
index 000000000000..35f0e857173e
--- /dev/null
+++ b/sw/qa/core/undo/data/textbox-cut-undo.docx
diff --git a/sw/qa/core/undo/undo.cxx b/sw/qa/core/undo/undo.cxx
index aeacffc78e9b..e43d154f3a66 100644
--- a/sw/qa/core/undo/undo.cxx
+++ b/sw/qa/core/undo/undo.cxx
@@ -10,11 +10,17 @@
 #include <swmodeltestbase.hxx>
 
 #include <unotools/mediadescriptor.hxx>
+#include <sfx2/viewfrm.hxx>
+#include <sfx2/dispatch.hxx>
 
 #include <unotxdoc.hxx>
 #include <docsh.hxx>
 #include <wrtsh.hxx>
 #include <swdtflvr.hxx>
+#include <frameformats.hxx>
+#include <fmtcntnt.hxx>
+#include <view.hxx>
+#include <cmdid.h>
 
 char const DATA_DIRECTORY[] = "/sw/qa/core/undo/data/";
 
@@ -50,6 +56,34 @@ CPPUNIT_TEST_FIXTURE(SwCoreUndoTest, testTextboxCutSave)
     xStorable->storeToURL(maTempFile.GetURL(), aMediaDescriptor.getAsConstPropertyValueList());
 }
 
+CPPUNIT_TEST_FIXTURE(SwCoreUndoTest, testTextboxCutUndo)
+{
+    load(DATA_DIRECTORY, "textbox-cut-undo.docx");
+    SwXTextDocument* pTextDoc = dynamic_cast<SwXTextDocument*>(mxComponent.get());
+    SwDocShell* pDocShell = pTextDoc->GetDocShell();
+    SwWrtShell* pWrtShell = pDocShell->GetWrtShell();
+    SwDoc* pDoc = pDocShell->GetDoc();
+    SwView* pView = pDoc->GetDocShell()->GetView();
+
+    pView->GetViewFrame()->GetDispatcher()->Execute(FN_CNTNT_TO_NEXT_FRAME, SfxCallMode::SYNCHRON);
+    pView->StopShellTimer();
+    rtl::Reference<SwTransferable> pTransfer = new SwTransferable(*pWrtShell);
+    pTransfer->Cut();
+    SwFrameFormats& rSpzFrameFormats = *pDoc->GetSpzFrameFormats();
+    CPPUNIT_ASSERT_EQUAL(static_cast<size_t>(0), rSpzFrameFormats.size());
+
+    pWrtShell->Undo();
+    CPPUNIT_ASSERT_EQUAL(static_cast<size_t>(2), rSpzFrameFormats.size());
+
+    const SwNodeIndex* pIndex1 = rSpzFrameFormats[0]->GetContent().GetContentIdx();
+    const SwNodeIndex* pIndex2 = rSpzFrameFormats[1]->GetContent().GetContentIdx();
+    // Without the accompanying fix in place, this test would have failed with:
+    // - Expected: 5
+    // - Actual  : 8
+    // i.e. the draw frame format had a wrong node index in its content.
+    CPPUNIT_ASSERT_EQUAL(pIndex1->GetIndex(), pIndex2->GetIndex());
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/sw/source/core/undo/undobj1.cxx b/sw/source/core/undo/undobj1.cxx
index 0f969713862a..2398ea8dad09 100644
--- a/sw/source/core/undo/undobj1.cxx
+++ b/sw/source/core/undo/undobj1.cxx
@@ -130,6 +130,13 @@ void SwUndoFlyBase::InsFly(::sw::UndoRedoContext & rContext, bool bShowSelFrame)
                 pSdrObject->setUnoShape(nullptr);
             }
         }
+        if (m_pFrameFormat->Which() == RES_DRAWFRMFMT)
+        {
+            // This is a draw format and we just set the fly format's textbox pointer to this draw
+            // format.  Sync the draw format's content with the fly format's content.
+            SwFrameFormat* pFlyFormat = m_pFrameFormat->GetOtherTextBoxFormat();
+            m_pFrameFormat->SetFormatAttr(pFlyFormat->GetContent());
+        }
     }
 
     m_pFrameFormat->MakeFrames();