Wayland: Fix copying inside the app

Fixes deadlock when copy/pasting in CopyQ (for example: item to editor
or search bar).

This relies on clipboard implementation in Qt.

src/platform/x11/x11platformclipboard.cpp

@@ -148,26 +148,8 @@ void X11PlatformClipboard::setData(ClipboardMode mode, const QVariantMap &dataMa
     if ( X11Info::isPlatformX11() ) {
         // WORKAROUND: Avoid getting X11 warning "QXcbClipboard: SelectionRequest too old".
         QCoreApplication::processEvents();
-        DummyClipboard::setData(mode, dataMap);
-    } else {
-        const auto data = createMimeData(dataMap);
-        const auto qmode = modeToQClipboardMode(mode);
-        WaylandClipboard::instance()->setMimeData(data, qmode);
-
-        // This makes pasting the clipboard work in own widgets.
-        const auto data2 = createMimeData(dataMap);
-        QGuiApplication::clipboard()->setMimeData(data2, qmode);
-    }
-}
-
-void X11PlatformClipboard::setRawData(ClipboardMode mode, QMimeData *mimeData)
-{
-    if ( X11Info::isPlatformX11() ) {
-        DummyClipboard::setRawData(mode, mimeData);
-    } else {
-        const auto qmode = modeToQClipboardMode(mode);
-        WaylandClipboard::instance()->setMimeData(mimeData, qmode);
     }
+    DummyClipboard::setData(mode, dataMap);
 }
 
 const QMimeData *X11PlatformClipboard::rawMimeData(ClipboardMode mode) const

src/platform/x11/x11platformclipboard.h

@@ -21,7 +21,6 @@ class X11PlatformClipboard final : public DummyClipboard
     QVariantMap data(ClipboardMode mode, const QStringList &formats) const override;
 
     void setData(ClipboardMode mode, const QVariantMap &dataMap) override;
-    void setRawData(ClipboardMode mode, QMimeData *mimeData) override;
 
     bool isSelectionSupported() const override { return m_selectionSupported; }