remember the last used activity per layout

app/layout.cpp

@@ -26,6 +26,8 @@
 #include <QFile>
 #include <KSharedConfig>
 
+#include <KActivities/Consumer>
+
 namespace Latte {
 
 const QString Layout::MultipleLayoutsName = ".multiple-layouts_hidden";
@@ -164,7 +166,12 @@ void Layout::initToCorona(DockCorona *corona)
 
     qDebug() << "Layout ::::: " << name() << " added contaiments ::: " << m_containments.size();
 
+    updateLastUsedActivity();
+
     connect(m_corona, &Plasma::Corona::containmentAdded, this, &Layout::addContainment);
+
+    connect(m_corona->m_activityConsumer, &KActivities::Consumer::currentActivityChanged,
+            this, &Layout::updateLastUsedActivity);
 }
 
 int Layout::version() const
@@ -512,6 +519,24 @@ const QStringList Layout::appliedActivities()
     }
 }
 
+QString Layout::lastUsedActivityId()
+{
+    return m_lastUsedActivityId;
+}
+
+void Layout::updateLastUsedActivity()
+{
+    if (!m_corona) {
+        return;
+    }
+
+    QString currentId = m_corona->activitiesConsumer()->currentActivity();
+
+    if (appliedActivities().contains(currentId)) {
+        m_lastUsedActivityId = currentId;
+    }
+}
+
 void Layout::destroyedChanged(bool destroyed)
 {
     if (!m_corona) {

app/layout.h

@@ -68,12 +68,14 @@ public:
     int version() const;
     void setVersion(int ver);
 
-    QString name() const;
-    QString file() const;
-
     QString color() const;
     void setColor(QString color);
 
+    QString lastUsedActivityId();
+
+    QString name() const;
+    QString file() const;
+
     QStringList activities() const;
     void setActivities(QStringList activities);
 
@@ -124,6 +126,7 @@ private slots:
     void appletCreated(Plasma::Applet *applet);
     void destroyedChanged(bool destroyed);
     void containmentDestroyed(QObject *cont);
+    void updateLastUsedActivity();
 
 private:
     void importLocalLayout(QString file);
@@ -145,6 +148,7 @@ private:
     int m_version{2};
 
     QString m_color;
+    QString m_lastUsedActivityId{"0"}; //the last used activity for this layout
     QString m_layoutFile;
     QString m_layoutName;
     QStringList m_activities;

app/layoutmanager.cpp

@@ -604,10 +604,13 @@ bool LayoutManager::switchToLayout(QString layoutName, int previousMemoryUsage)
         Layout *layout = activeLayout(layoutName);
 
         if (layout) {
-            QStringList appliedActivities = layout->appliedActivities();
 
+            QStringList appliedActivities = layout->appliedActivities();
+            QString nextActivity = layout->lastUsedActivityId() != "0" ? layout->lastUsedActivityId() : appliedActivities[0];
+
+            //! it means we are at a foreign activity
             if (!appliedActivities.contains(m_corona->activitiesConsumer()->currentActivity())) {
-                m_activitiesController->setCurrentActivity(appliedActivities[0]);
+                m_activitiesController->setCurrentActivity(nextActivity);
                 return true;
             }
         }