[CurrentContainmentActionsModel] Add configurationChanged signal

This allows the config UI to know when to enable the Apply button.
Currently we only do that when the shortcut or actions themselves change but not their configuration.

Differential Revision: https://phabricator.kde.org/D6443

shell/currentcontainmentactionsmodel.cpp

@@ -222,6 +222,8 @@ void CurrentContainmentActionsModel::showConfiguration(int row, QQuickItem *ctx)
                 pluginInstance->configurationAccepted();
             });
 
+    connect(configDlg, &QDialog::accepted, this, &CurrentContainmentActionsModel::configurationChanged);
+
     connect(pluginInstance, &QObject::destroyed, configDlg, &QDialog::reject);
 
     configDlg->show();

shell/currentcontainmentactionsmodel.h

@@ -60,6 +60,9 @@ public:
     Q_INVOKABLE void showAbout(int row, QQuickItem *ctx = nullptr);
     Q_INVOKABLE void save();
 
+signals:
+    void configurationChanged();
+
 private:
     Plasma::Containment *m_containment;
     QHash<QString, Plasma::ContainmentActions *> m_plugins;