tdf#158947 sw: Don't unrelatedly overwrite system clipboard on paste

In `SwTransferable::RemoveDDELinkFormat`, only update the
clipboard content with this `SwTransferable` after removing
the `SotClipboardFormatId::LINK` from the supported formats
if the `SwTransferable` was the clipboard content before
already.

Doing so always would unrelatedly overwrite what was previously
copied from another application to the clipboard for the
tdf#158947 scenario of pasting clipboard content of another
application over a selection when using the Qt-based VCL plugins
on Wayland (s. backtrace below that shows how the clipboard content
was overwritten, frame #17 is the method changed in this
commit).

My assumption why the clipboard content is explicitly overwritten
at all is to make sure that the system clipboard on some platforms
gets notified about the change in supported formats/mime
types after removing one. But that isn't necessary when the
transfer data modified here aren't the current clipboard content
in the first place.

Backtrace for how clipboard content was previously overwritten
for the tdf#158947 scenario with the qt6 VCL plugin on Wayland:

    ~"#0  QtClipboard::handleChanged(QClipboard::Mode) (this=0x557f90457770, aMode=QClipboard::Clipboard) at .../libreoffice/vcl/qt6/../qt5/QtClipboard.cxx:156\n"
    ~"#1  0x00007f26f08844ff in QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<QClipboard::Mode>, void, void (QtClipboard::*)(QClipboard::Mode)>::call(void (QtClipboard::*)(QClipboard::Mode), QtClipboard*, void**)::{lambda()#1}::operator()() const (__closure=0x7ffe889a2c20) at .../qt5/qtbase/src/corelib/kernel/qobjectdefs_impl.h:153\n"
    ~"#2  0x00007f26f0884ffb in QtPrivate::FunctorCallBase::call_internal<void, QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<QClipboard::Mode>, void, void (QtClipboard::*)(QClipboard::Mode)>::call(void (QtClipboard::*)(QClipboard::Mode), QtClipboard*, void**)::{lambda()#1}>(void**, QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<QClipboard::Mode>, void, void (QtClipboard::*)(QClipboard::Mode)>::call(void (QtClipboard::*)(QClipboard::Mode), QtClipboard*, void**)::{lambda()#1}&&) (args=0x7ffe889a2ed0, fn=...) at .../qt5/qtbase/src/corelib/kernel/qobjectdefs_impl.h:72\n"
    ~"#3  0x00007f26f088456f in QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<QClipboard::Mode>, void, void (QtClipboard::*)(QClipboard::Mode)>::call(void (QtClipboard::*)(QClipboard::Mode), QtClipboard*, void**) (f=(void (QtClipboard::*)(QtClipboard * const, QClipboard::Mode)) 0x7f26f087a76e <QtClipboard::handleChanged(QClipboard::Mode)>, o=0x557f90457770, arg=0x7ffe889a2ed0) at .../qt5/qtbase/src/corelib/kernel/qobjectdefs_impl.h:152\n"
    ~"#4  0x00007f26f08833de in QtPrivate::FunctionPointer<void (QtClipboard::*)(QClipboard::Mode)>::call<QtPrivate::List<QClipboard::Mode>, void>(void (QtClipboard::*)(QClipboard::Mode), QtClipboard*, void**) (f=(void (QtClipboard::*)(QtClipboard * const, QClipboard::Mode)) 0x7f26f087a76e <QtClipboard::handleChanged(QClipboard::Mode)>, o=0x557f90457770, arg=0x7ffe889a2ed0) at .../qt5/qtbase/src/corelib/kernel/qobjectdefs_impl.h:200\n"
    ~"#5  0x00007f26f0881f71 in QtPrivate::QCallableObject<void (QtClipboard::*)(QClipboard::Mode), QtPrivate::List<QClipboard::Mode>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (which=1, this_=0x557f904555f0, r=0x557f90457770, a=0x7ffe889a2ed0, ret=0x0) at .../qt5/qtbase/src/corelib/kernel/qobjectdefs_impl.h:571\n"
    ~"#6  0x00007f26efdb863f in QtPrivate::QSlotObjectBase::call(QObject*, void**) (this=0x557f904555f0, r=0x557f90457770, a=0x7ffe889a2ed0) at .../qt5/qtbase/src/corelib/kernel/qobjectdefs_impl.h:487\n"
    ~"#7  0x00007f26efe5772e in doActivate<false>(QObject*, int, void**) (sender=0x557f8d510fd0, signal_index=3, argv=0x7ffe889a2ed0) at .../qt5/qtbase/src/corelib/kernel/qobject.cpp:4116\n"
    ~"#8  0x00007f26efe4cdef in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=0x557f8d510fd0, m=0x7f26efa47cc0 <QClipboard::staticMetaObject>, local_signal_index=0, argv=0x7ffe889a2ed0) at .../qt5/qtbase/src/corelib/kernel/qobject.cpp:4176\n"
    ~"#9  0x00007f26eede9fcc in QClipboard::changed(QClipboard::Mode) (this=0x557f8d510fd0, _t1=QClipboard::Clipboard) at .../qt5/qtbase/src/gui/Gui_autogen/include/moc_qclipboard.cpp:182\n"
    ~"#10 0x00007f26eede9bc1 in QClipboard::emitChanged(QClipboard::Mode) (this=0x557f8d510fd0, mode=QClipboard::Clipboard) at .../qt5/qtbase/src/gui/kernel/qclipboard.cpp:558\n"
    ~"#11 0x00007f26eee4ed69 in QPlatformClipboard::emitChanged(QClipboard::Mode) (this=0x557f88019c20, mode=QClipboard::Clipboard) at .../qt5/qtbase/src/gui/kernel/qplatformclipboard.cpp:89\n"
    ~"#12 0x00007f26ed78809e in QtWaylandClient::QWaylandClipboard::setMimeData(QMimeData*, QClipboard::Mode) (this=0x557f88019c20, data=0x557f8fb87930, mode=QClipboard::Clipboard) at .../qt5/qtwayland/src/client/qwaylandclipboard.cpp:89\n"
    ~"#13 0x00007f26eede99de in QClipboard::setMimeData(QMimeData*, QClipboard::Mode) (this=0x557f8d510fd0, src=0x557f8fb87930, mode=QClipboard::Clipboard) at .../qt5/qtbase/src/gui/kernel/qclipboard.cpp:447\n"
    ~"#14 0x00007f26f087a5b5 in QtClipboard::setContents(com::sun::star::uno::Reference<com::sun::star::datatransfer::XTransferable> const&, com::sun::star::uno::Reference<com::sun::star::datatransfer::clipboard::XClipboardOwner> const&) (this=0x557f8d50cbb0, xTrans=uno::Reference to (SwTransferable *) 0x557f90440118, xClipboardOwner=uno::Reference to (SwTransferable *) 0x557f90440120) at .../libreoffice/vcl/qt6/../qt5/QtClipboard.cxx:137\n"
    ~"#15 0x00007f26fb05bacc in TransferableHelper::CopyToClipboard(com::sun::star::uno::Reference<com::sun::star::datatransfer::clipboard::XClipboard> const&) const (this=0x557f904400f0, rClipboard=uno::Reference to (QtClipboard *) 0x557f8d50cc10) at .../libreoffice/vcl/source/treelist/transfer.cxx:942\n"
    ~"#16 0x00007f26fb05bc77 in TransferableHelper::CopyToClipboard(vcl::Window*) const (this=0x557f904400f0, pWindow=0x557f8932d1f0) at .../libreoffice/vcl/source/treelist/transfer.cxx:957\n"
    ~"#17 0x00007f26b5130940 in SwTransferable::RemoveDDELinkFormat(vcl::Window&) (this=0x557f904400f0, rWin=...) at .../libreoffice/sw/source/uibase/dochdl/swdtflvr.cxx:385\n"
    ~"#18 0x00007f26b51440ab in SwTransferDdeLink::DataChanged(rtl::OUString const&, com::sun::star::uno::Any const&) (this=0x557f8fb864e0) at .../libreoffice/sw/source/uibase/dochdl/swdtflvr.cxx:4447\n"
    ~"#19 0x00007f270120fa0e in sfx2::SvLinkSource::NotifyDataChanged() (this=0x557f8fb8bbe0) at .../libreoffice/sfx2/source/appl/linksrc.cxx:291\n"
    ~"#20 0x00007f26b43210ba in SwServerObject::SendDataChanged(SwPaM const&) (this=0x557f8fb8bbe0, rRange=SwPaM = {...}) at .../libreoffice/sw/source/core/doc/swserv.cxx:177\n"
    ~"#21 0x00007f26b43217c2 in SwDataChanged::~SwDataChanged() (this=0x7ffe889a3520, __in_chrg=<optimized out>) at .../libreoffice/sw/source/core/doc/swserv.cxx:308\n"
    ~"#22 0x00007f26b4233c8b in sw::DocumentContentOperationsManager::DeleteRangeImplImpl(SwPaM&, SwDeleteFlags) (this=0x557f8d2b8000, rPam=SwPaM = {...}, flags=SwDeleteFlags::Default) at .../libreoffice/sw/source/core/doc/DocumentContentOperationsManager.cxx:4474\n"
    ~"#23 0x00007f26b4233826 in sw::DocumentContentOperationsManager::DeleteRangeImpl(SwPaM&, SwDeleteFlags) (this=0x557f8d2b8000, rPam=SwPaM = {...}, flags=SwDeleteFlags::Default) at .../libreoffice/sw/source/core/doc/DocumentContentOperationsManager.cxx:4419\n"
    ~"#24 0x00007f26b4233681 in sw::DocumentContentOperationsManager::DeleteAndJoinImpl(SwPaM&, SwDeleteFlags) (this=0x557f8d2b8000, rPam=SwPaM = {...}, flags=SwDeleteFlags::Default) at .../libreoffice/sw/source/core/doc/DocumentContentOperationsManager.cxx:4391\n"
    ~"#25 0x00007f26b421edb7 in (anonymous namespace)::lcl_DoWithBreaks(sw::DocumentContentOperationsManager&, SwPaM&, SwDeleteFlags, bool (sw::DocumentContentOperationsManager::*)(sw::DocumentContentOperationsManager* const, SwPaM&, SwDeleteFlags)) (rDocumentContentOperations=..., rPam=SwPaM = {...}, flags=SwDeleteFlags::Default, pFunc=(bool (sw::DocumentContentOperationsManager::*)(sw::DocumentContentOperationsManager * const, SwPaM &, SwDeleteFlags)) 0x7f26b4233632 <sw::DocumentContentOperationsManager::DeleteAndJoinImpl(SwPaM&, SwDeleteFlags)>) at .../libreoffice/sw/source/core/doc/DocumentContentOperationsManager.cxx:681\n"
    ~"#26 0x00007f26b42279df in sw::DocumentContentOperationsManager::DeleteAndJoin(SwPaM&, SwDeleteFlags) (this=0x557f8d2b8000, rPam=SwPaM = {...}, flags=SwDeleteFlags::Default) at .../libreoffice/sw/source/core/doc/DocumentContentOperationsManager.cxx:2367\n"
    ~"#27 0x00007f26b44a71f6 in SwEditShell::DeleteSel(SwPaM&, bool, bool, bool*) (this=0x557f8d51b300, rPam=SwPaM = {...}, isArtificialSelection=false, goLeft=false, pUndo=0x7ffe889a3be6) at .../libreoffice/sw/source/core/edit/eddel.cxx:122\n"
    ~"#28 0x00007f26b44a7671 in SwEditShell::Delete(bool, bool) (this=0x557f8d51b300, isArtificialSelection=false, goLeft=false) at .../libreoffice/sw/source/core/edit/eddel.cxx:164\n"
    ~"#29 0x00007f26b5604933 in SwWrtShell::DelRight(bool) (this=0x557f8d51b300, isReplaceHeuristic=false) at .../libreoffice/sw/source/uibase/wrtsh/delete.cxx:312\n"
    ~"#30 0x00007f26b512fe14 in (anonymous namespace)::SwTrnsfrActionAndUndo::SwTrnsfrActionAndUndo(SwWrtShell*, bool, SwPasteContext*) (this=0x557f9045b020, pS=0x557f8d51b300, bDelSel=true, pContext=0x7ffe889a4220) at .../libreoffice/sw/source/uibase/dochdl/swdtflvr.cxx:236\n"
    ~"#31 0x00007f26b51377c1 in SwTransferable::PasteData(TransferableDataHelper const&, SwWrtShell&, unsigned char, SotExchangeActionFlags, SotClipboardFormatId, SotExchangeDest, bool, bool, Point const*, signed char, bool, RndStdIds, bool, SwPasteContext*, PasteTableType) (rData=..., rSh=..., nAction=36 '$', nActionFlags=(SotExchangeActionFlags::InsertImageMap | SotExchangeActionFlags::InsertTargetUrl), nFormat=SotClipboardFormatId::HTML, nDestination=SotExchangeDest::SWDOC_FREE_AREA, bIsPasteFormat=false, bIsDefault=false, pPt=0x0, nDropAction=0 '\\000', bPasteSelection=false, nAnchorType=RndStdIds::FLY_AT_PARA, bIgnoreComments=false, pContext=0x7ffe889a4220, ePasteTable=PasteTableType::PASTE_DEFAULT) at .../libreoffice/sw/source/uibase/dochdl/swdtflvr.cxx:1768\n"
    ~"#32 0x00007f26b5137333 in SwTransferable::Paste(SwWrtShell&, TransferableDataHelper&, RndStdIds, bool, PasteTableType) (rSh=..., rData=..., nAnchorType=RndStdIds::FLY_AT_PARA, bIgnoreComments=false, ePasteTable=PasteTableType::PASTE_DEFAULT) at .../libreoffice/sw/source/uibase/dochdl/swdtflvr.cxx:1687\n"
    ~"#33 0x00007f26b52d29e9 in SwBaseShell::ExecClpbrd(SfxRequest&) (this=0x557f8db64330, rReq=...) at .../libreoffice/sw/source/uibase/shells/basesh.cxx:365\n"
    ~"#34 0x00007f26b52d1681 in SfxStubSwBaseShellExecClpbrd(SfxShell*, SfxRequest&) (pShell=0x557f8db64330, rReq=...) at .../libreoffice/workdir/SdiTarget/sw/sdi/swslots.hxx:2219\n"
    ~"#35 0x00007f27012d14dc in SfxDispatcher::Call_Impl(SfxShell&, SfxSlot const&, SfxRequest&, bool) (this=0x557f8d4f46b0, rShell=..., rSlot=..., rReq=..., bRecord=true) at .../libreoffice/sfx2/source/control/dispatch.cxx:254\n"
    ~"#36 0x00007f27012d4b34 in SfxDispatcher::Execute_(SfxShell&, SfxSlot const&, SfxRequest&, SfxCallMode) (this=0x557f8d4f46b0, rShell=..., rSlot=..., rReq=..., eCallMode=SfxCallMode::RECORD) at .../libreoffice/sfx2/source/control/dispatch.cxx:753\n"
    ~"#37 0x00007f27012c05d4 in SfxBindings::Execute_Impl(SfxRequest&, SfxSlot const*, SfxShell*) (this=0x557f8d503240, aReq=..., pSlot=0x7f26b6cf5360 <aSwBaseShellSlots_Impl+1440>, pShell=0x557f8db64330) at .../libreoffice/sfx2/source/control/bindings.cxx:1057\n"
    ~"#38 0x00007f270139813d in SfxDispatchController_Impl::dispatch(com::sun::star::util::URL const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::frame::XDispatchResultListener> const&) (this=0x557f8db682a0, aURL=..., aArgs=empty uno::Sequence, rListener=empty uno::Reference) at .../libreoffice/sfx2/source/control/unoctitm.cxx:688\n"
    ~"#39 0x00007f2701395dbf in SfxOfficeDispatch::dispatch(com::sun::star::util::URL const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&) (this=0x557f8db68200, aURL=..., aArgs=empty uno::Sequence) at .../libreoffice/sfx2/source/control/unoctitm.cxx:250\n"
    ~"#40 0x00007f26fe03d948 in svt::(anonymous namespace)::AsyncAccelExec::impl_ts_asyncCallback(LinkParamNone*) (this=0x557f8fb8e070) at .../libreoffice/svtools/source/misc/acceleratorexecute.cxx:508\n"
    ~"#41 0x00007f26fe03d869 in svt::(anonymous namespace)::AsyncAccelExec::LinkStubimpl_ts_asyncCallback(void*, LinkParamNone*) (instance=0x557f8fb8e070, data=0x0) at .../libreoffice/svtools/source/misc/acceleratorexecute.cxx:500\n"
    ~"#42 0x00007f26fab0db3b in Link<LinkParamNone*, void>::Call(LinkParamNone*) const (this=0x557f8fb8e110, data=0x0) at .../libreoffice/include/tools/link.hxx:111\n"
    ~"#43 0x00007f26fb469f3d in vcl::EventPoster::DoEvent_Impl(void*) (this=0x557f8fb8e108) at .../libreoffice/vcl/source/helper/evntpost.cxx:52\n"
    ~"#44 0x00007f26fb469f05 in vcl::EventPoster::LinkStubDoEvent_Impl(void*, void*) (instance=0x557f8fb8e108, data=0x0) at .../libreoffice/vcl/source/helper/evntpost.cxx:48\n"
    ~"#45 0x00007f26fadc2373 in Link<void*, void>::Call(void*) const (this=0x7f26e80153b8, data=0x0) at .../libreoffice/include/tools/link.hxx:111\n"
    ~"#46 0x00007f26fadbf458 in ImplHandleUserEvent(ImplSVEvent*) (pSVEvent=0x7f26e80153b0) at .../libreoffice/vcl/source/window/winproc.cxx:2287\n"
    ~"#47 0x00007f26fadc1385 in ImplWindowFrameProc(vcl::Window*, SalEvent, void const*) (_pWindow=0x557f897d0e90, nEvent=SalEvent::UserEvent, pEvent=0x7f26e80153b0) at .../libreoffice/vcl/source/window/winproc.cxx:2851\n"
    ~"#48 0x00007f26f08b6bae in SalFrame::CallCallback(SalEvent, void const*) const (this=0x557f8800cf80, nEvent=SalEvent::UserEvent, pEvent=0x7f26e80153b0) at .../libreoffice/vcl/inc/salframe.hxx:310\n"
    ~"#49 0x00007f26f08d9dbf in QtInstance::ProcessEvent(SalUserEventList::SalUserEvent) (this=0x557f88020780, aEvent=...) at .../libreoffice/vcl/qt6/../qt5/QtInstance.cxx:516\n"
    ~"#50 0x00007f26fb47b97f in operator()() const (__closure=0x7ffe889a50e0) at .../libreoffice/vcl/source/app/salusereventlist.cxx:119\n"
    ~"#51 0x00007f26fb47bc53 in SalUserEventList::DispatchUserEvents(bool) (this=0x557f880207b8, bHandleAllCurrentEvents=false) at .../libreoffice/vcl/source/app/salusereventlist.cxx:120\n"
    ~"#52 0x00007f26f08d98a4 in QtInstance::ImplYield(bool, bool) (this=0x557f88020780, bWait=true, bHandleAllCurrentEvents=false) at .../libreoffice/vcl/qt6/../qt5/QtInstance.cxx:442\n"
    ~"#53 0x00007f26f08d9a4f in QtInstance::DoYield(bool, bool) (this=0x557f88020780, bWait=true, bHandleAllCurrentEvents=false) at .../libreoffice/vcl/qt6/../qt5/QtInstance.cxx:464\n"
    ~"#54 0x00007f26fb5390d0 in ImplYield(bool, bool) (i_bWait=true, i_bAllEvents=false) at .../libreoffice/vcl/source/app/svapp.cxx:390\n"
    ~"#55 0x00007f26fb539e6e in Application::Yield() () at .../libreoffice/vcl/source/app/svapp.cxx:474\n"
    ~"#56 0x00007f26fb538dc3 in Application::Execute() () at .../libreoffice/vcl/source/app/svapp.cxx:368\n"
    ~"#57 0x00007f2704e371b6 in desktop::Desktop::Main() (this=0x7ffe889a5c10) at .../libreoffice/desktop/source/app/app.cxx:1614\n"
    ~"#58 0x00007f26fb558292 in ImplSVMain() () at .../libreoffice/vcl/source/app/svmain.cxx:229\n"
    ~"#59 0x00007f26fb5585a7 in SVMain() () at .../libreoffice/vcl/source/app/svmain.cxx:261\n"
    ~"#60 0x00007f2704ea4307 in soffice_main() () at .../libreoffice/desktop/source/app/sofficemain.cxx:94\n"
    ~"#61 0x0000557f862d19d4 in sal_main () at .../libreoffice/desktop/source/app/main.c:51\n"
    ~"#62 0x0000557f862d19ba in main (argc=3, argv=0x7ffe889a5e38) at .../libreoffice/desktop/source/app/main.c:49\n"
    2906^done
    (gdb)

Change-Id: I1f517d441eeb3e77e969062b884d9a425038b22a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163202
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <[email protected]>
(cherry picked from commit cb9513c)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/163179
Reviewed-by: Michael Stahl <[email protected]>

sw/source/uibase/dochdl/swdtflvr.cxx

@@ -382,7 +382,8 @@ const Graphic* SwTransferable::FindOLEReplacementGraphic() const
 void SwTransferable::RemoveDDELinkFormat(vcl::Window& rWin)
 {
     RemoveFormat( SotClipboardFormatId::LINK );
-    CopyToClipboard(&rWin);
+    if (rWin.GetClipboard()->getContents().get() == this)
+        CopyToClipboard(&rWin);
 }
 
 void SwTransferable::DisconnectDDE()