sw: layout: fix crash when deleting page with section being formatted

This crashes only when calling storeToURL() with writer_pdf_Export?

There is a text frame 112, followed by section frame 126, which contains
table frame 127.

The section frame 126 is being formatted, which in
SwFrame::PrepareMake() formats its prev, text frame 112.

This does MoveBwd() and in SwContentFrame::MakeAll() formats its next,
tab frame 127.

This also does MoveBwd() and then there is this really odd condition in
SwTabFrame::Paste() where it calls SwFrame::CheckPageDescs() if it
*doesn't* have a RES_PAGEDESC item and the page has a non-default page
style - this condition remains inexplicable since initial CVS import.

Then CheckPageDesc() sees the (next) page is empty and deletes it.

So check in sw::IsPageFrameEmpty() that there aren't any sections with
IsDeleteForbidden() set.

(regression from commit b9ef71476fd70bc13f50ebe80390e0730d1b7afb)

Change-Id: I3c64fe40fabffc255c4146a35c678ce6a1cc09c9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/133222
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
(cherry picked from commit 85aa57359befd7a21b3fdf36f2b362f50495f77c)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/133151
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
(cherry picked from commit 116b246e42a1c807e4e693bd020231a22f05abcd)

1 files changed, 1 insertions, 0 deletions

diff --git a/sw/source/core/inc/layfrm.hxx b/sw/source/core/inc/layfrm.hxx
index f39c9ae513e9..589133216ea6 100644
--- a/sw/source/core/inc/layfrm.hxx
+++ b/sw/source/core/inc/layfrm.hxx
@@ -99,6 +99,7 @@ public:
                         SwPrintData const*const pPrintData = nullptr ) const override;
     const SwFrame *Lower() const { return m_pLower; }
           SwFrame *Lower()       { return m_pLower; }
+    bool ContainsDeleteForbiddenLayFrame() const;
     const SwContentFrame *ContainsContent() const;
     inline SwContentFrame *ContainsContent();
     const SwCellFrame *FirstCell() const;