Fix loading of effect config plugins

X-KDE-ParentComponents is a list, so we have to check if this list
contains the plugin, not do a string comparison. It seems the
queryparser has become a bit stricter in this case. This query should be
fixed anyway, however, and it fixes a fairly important bug in the effect
system.

REVIEW:122821

kcmkwin/kwincompositing/effectconfig.cpp

@@ -65,7 +65,7 @@ void EffectConfig::openConfig(const QString &serviceName, bool scripted, const Q
         }
     } else {
         kcm = KPluginTrader::createInstanceFromQuery<KCModule>(s_pluginDir, QString(),
-                                                               QStringLiteral("[X-KDE-ParentComponents] == '%1'").arg(serviceName),
+                                                               QStringLiteral("'%1' in [X-KDE-ParentComponents]").arg(serviceName),
                                                                &dialog);
     }
     if (!kcm) {

kcmkwin/kwindesktop/main.cpp

@@ -619,7 +619,7 @@ void KWinDesktopConfig::slotConfigureEffectClicked()
 
     QPointer<QDialog> configDialog = new QDialog(this);
     KCModule *kcm = KPluginTrader::createInstanceFromQuery<KCModule>(QStringLiteral("kwin/effects/configs/"), QString(),
-                                                                     QStringLiteral("[X-KDE-ParentComponents] == '%1'").arg(effect),
+                                                                     QStringLiteral("'%1' in [X-KDE-ParentComponents]").arg(effect),
                                                                      configDialog);
     if (!kcm) {
         delete configDialog;

kcmkwin/kwintabbox/main.cpp

@@ -539,7 +539,7 @@ void KWinTabBoxConfig::configureEffectClicked()
         const QString name = BuiltInEffects::nameForEffect(effect == CoverSwitch ? BuiltInEffect::CoverSwitch : BuiltInEffect::FlipSwitch);
 
         KCModule *kcm = KPluginTrader::createInstanceFromQuery<KCModule>(QStringLiteral("kwin/effects/configs/"), QString(),
-                                                                        QStringLiteral("[X-KDE-ParentComponents] == '%1'").arg(name),
+                                                                         QStringLiteral("'%1' in [X-KDE-ParentComponents]").arg(name),
                                                                         configDialog);
         if (!kcm) {
             delete configDialog;