lazy setting of xbc properties on qApp

just a wild guess - the crashes showed up
somewhen after the early setting of the property/
X11Info access - if this indeed is the cause, they
should disappear or only appear after actually using
the detect button. We'll see.

CCBUG: 346748
REVIEW: 123777

kcmkwin/kwinrules/detectwidget.cpp

@@ -171,6 +171,8 @@ QByteArray DetectDialog::selectedMachine() const
 void DetectDialog::selectWindow()
 {
     if (!KWin::Cursor::self()) {
+        qApp->setProperty("x11Connection", QVariant::fromValue<void*>(QX11Info::connection()));
+        qApp->setProperty("x11RootWindow", QVariant::fromValue(QX11Info::appRootWindow()));
         KWin::Cursor::create(this);
     }
     // use a dialog, so that all user input is blocked

kcmkwin/kwinrules/kcm.cpp

@@ -41,10 +41,6 @@ KCMRules::KCMRules(QWidget *parent, const QVariantList &)
     : KCModule(parent)
     , config("kwinrulesrc")
 {
-    if (QX11Info::isPlatformX11()) {
-        qApp->setProperty("x11Connection", QVariant::fromValue<void*>(QX11Info::connection()));
-        qApp->setProperty("x11RootWindow", QVariant::fromValue(QX11Info::appRootWindow()));
-    }
     QVBoxLayout *layout = new QVBoxLayout(this);
     layout->setMargin(0);
 

kcmkwin/kwinrules/main.cpp

@@ -245,10 +245,6 @@ KWIN_EXPORT int kdemain(int argc, char* argv[])
     app.setApplicationDisplayName(i18n("KWin"));
     app.setApplicationName("kwin_rules_dialog");
     app.setApplicationVersion("1.0");
-    if (QX11Info::isPlatformX11()) {
-        app.setProperty("x11Connection", QVariant::fromValue<void*>(QX11Info::connection()));
-        app.setProperty("x11RootWindow", QVariant::fromValue(QX11Info::appRootWindow()));
-    }
     bool whole_app = false;
     bool id_ok = false;
     Window id = None;