tdf#129930: Dispose SystemClipboard service early enough

At least on Windows, the related
CMtaOleClipboard::m_hClipboardChangedNotifierThread thread would otherwise still
run during cppuhelper::ServiceManager::disposing (but could try to create other
UNO services, which then throws a DeploymentException).

(There is also a GetSystemPrimarySelection similar to GetSystemClipboard in
include/vcl/transfer.hxx, which might or might not turn out to have a similar
issue.)

Change-Id: Ia64e708cf0578e3a127c1a56fbace577ecf4ee1f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/86558
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

vcl/inc/svdata.hxx

@@ -102,6 +102,8 @@ class UITestLogger;
 #define SV_ICON_ID_DATABASE                            12
 #define SV_ICON_ID_FORMULA                             13
 
+namespace com::sun::star::datatransfer::clipboard { class XClipboard; }
+
 namespace vcl
 {
     class DisplayConnectionDispatch;
@@ -372,6 +374,10 @@ struct ImplSVData
 
     css::uno::Reference<css::i18n::XCharacterClassification> m_xCharClass;
 
+#if defined _WIN32
+    css::uno::Reference<css::datatransfer::clipboard::XClipboard> m_xSystemClipboard;
+#endif
+
     Link<LinkParamNone*,void> maDeInitHook;
 
     // LOK & headless backend specific hooks

vcl/source/app/svmain.cxx

@@ -484,6 +484,15 @@ void DeInitVCL()
     pSVData->maCtrlData.mpDisclosureMinus.reset();
     pSVData->mpDefaultWin.disposeAndClear();
 
+#if defined _WIN32
+    // See GetSystemClipboard (vcl/source/treelist/transfer2.cxx):
+    if (auto const comp = css::uno::Reference<css::lang::XComponent>(
+            pSVData->m_xSystemClipboard, css::uno::UNO_QUERY))
+    {
+        comp->dispose();
+    }
+#endif
+
 #ifndef NDEBUG
     DbgGUIDeInitSolarMutexCheck();
 #endif

vcl/source/treelist/transfer2.cxx

@@ -21,6 +21,7 @@
 
 #include <osl/mutex.hxx>
 #include <sot/exchange.hxx>
+#include <tools/debug.hxx>
 #include <vcl/svapp.hxx>
 #include <vcl/window.hxx>
 #include <comphelper/processfactory.hxx>
@@ -32,6 +33,7 @@
 #include <svl/urlbmk.hxx>
 #include <vcl/transfer.hxx>
 
+#include <svdata.hxx>
 
 using namespace ::com::sun::star::uno;
 using namespace ::com::sun::star::lang;
@@ -462,6 +464,26 @@ void TransferDataContainer::DragFinished( sal_Int8 nDropAction )
 
 Reference<XClipboard> GetSystemClipboard()
 {
+    // On Windows, the css.datatransfer.clipboard.SystemClipboard UNO service is implemented as a
+    // single-instance service (sysdtrans_component_getFactory,
+    // dtrans/source/win32/clipb/wcbentry.cxx) that needs timely disposing to join a spawned thread
+    // (done in DeInitVCL, vcl/source/app/svmain.cxx), while on other platforms it is implemented as
+    // a mutli-instance service (ClipboardFactory, vcl/source/components/dtranscomp.cxx) so we
+    // should not hold on to a single instance here:
+#if defined _WIN32
+    DBG_TESTSOLARMUTEX();
+    auto const data = ImplGetSVData();
+    if (!data->m_xSystemClipboard.is())
+    {
+        try
+        {
+            data->m_xSystemClipboard = css::datatransfer::clipboard::SystemClipboard::create(
+                comphelper::getProcessComponentContext());
+        }
+        catch (DeploymentException const &) {}
+    }
+    return data->m_xSystemClipboard;
+#else
     Reference<XClipboard> xClipboard;
     try
     {
@@ -470,6 +492,7 @@ Reference<XClipboard> GetSystemClipboard()
     }
     catch (DeploymentException const &) {}
     return xClipboard;
+#endif
 }
 
 Reference<XClipboard> GetSystemPrimarySelection()