tdf#122042: It's two clipboards, actually

Change-Id: I0e975bb73211b1d4ddb2e721659f64b361d11322
Reviewed-on: https://gerrit.libreoffice.org/65121
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

vcl/inc/qt5/Qt5Instance.hxx

@@ -40,7 +40,7 @@ class VCLPLUG_QT5_PUBLIC Qt5Instance : public QObject,
     osl::Condition m_aWaitingYieldCond;
     int m_postUserEventId;
     const bool m_bUseCairo;
-    css::uno::Reference<css::uno::XInterface> m_xClipboard;
+    std::unordered_map<OUString, css::uno::Reference<css::uno::XInterface>> m_aClipboards;
 
 public:
     std::unique_ptr<QApplication> m_pQApplication;

vcl/qt5/Qt5Instance.cxx

@@ -244,14 +244,17 @@ Qt5Instance::CreateClipboard(const css::uno::Sequence<css::uno::Any>& arguments)
                                                   css::uno::Reference<css::uno::XInterface>(), -1);
     }
 
-    if (!m_xClipboard.is())
+    auto it = m_aClipboards.find(sel);
+    if (it != m_aClipboards.end())
     {
-        css::uno::Reference<css::uno::XInterface> xClipboard(
-            static_cast<cppu::OWeakObject*>(new VclQt5Clipboard()));
-        m_xClipboard = xClipboard;
+        return it->second;
     }
 
-    return m_xClipboard;
+    css::uno::Reference<css::uno::XInterface> xClipboard(
+        static_cast<cppu::OWeakObject*>(new VclQt5Clipboard()));
+    m_aClipboards[sel] = xClipboard;
+
+    return xClipboard;
 }
 
 Reference<XInterface> Qt5Instance::CreateDragSource()