scripting: Drop registerWindow() workaround

desktopchangeosd appears to stop updating because kwin fails to deselect
XShape events.

src/scripting/scripting.cpp

@@ -609,21 +609,6 @@ QVariant KWin::JSEngineGlobalMethodsWrapper::readConfig(const QString &key, QVar
     return m_script->config().readEntry(key, defaultValue);
 }
 
-void KWin::JSEngineGlobalMethodsWrapper::registerWindow(QQuickWindow *window)
-{
-    if (kwinApp()->operationMode() == Application::OperationModeX11) {
-        // Windows stop updating if they are remapped. It seems like a bug in QtXCB.
-        QPointer<QQuickWindow> guard = window;
-        connect(
-            window, &QWindow::visibilityChanged, this, [guard](QWindow::Visibility visibility) {
-                if (guard && visibility == QWindow::Hidden) {
-                    guard->destroy();
-                }
-            },
-            Qt::QueuedConnection);
-    }
-}
-
 KWin::Scripting *KWin::Scripting::s_self = nullptr;
 
 KWin::Scripting *KWin::Scripting::create(QObject *parent)

src/scripting/scripting.h

@@ -298,7 +298,6 @@ public:
 
 public Q_SLOTS:
     QVariant readConfig(const QString &key, QVariant defaultValue = QVariant());
-    void registerWindow(QQuickWindow *window);
 
 private:
     DeclarativeScript *m_script;

src/scripts/desktopchangeosd/contents/ui/osd.qml

@@ -290,8 +290,4 @@ PlasmaCore.Dialog {
             dialogItem.show();
         }
     }
-
-    Component.onCompleted: {
-        KWin.registerWindow(dialog);
-    }
 }

src/unmanaged.cpp

@@ -19,7 +19,6 @@
 
 #include <QDebug>
 #include <QTimer>
-#include <QWidget>
 #include <QWindow>
 
 #include <xcb/shape.h>
@@ -149,7 +148,7 @@ void Unmanaged::release(ReleaseReason releaseReason)
     }
     Deleted *del = Deleted::create(this);
     Q_EMIT closed(del);
-    if (!QWidget::find(window()) && releaseReason != ReleaseReason::Destroyed) { // don't affect our own windows
+    if (releaseReason != ReleaseReason::Destroyed && !findInternalWindow()) { // don't affect our own windows
         if (Xcb::Extensions::self()->isShapeAvailable()) {
             xcb_shape_select_input(kwinApp()->x11Connection(), window(), false);
         }