Move PIN generation into ComputerManager to be shared with CLI pairing

app/backend/computermanager.cpp

@@ -10,6 +10,8 @@
 #include <QThreadPool>
 #include <QCoreApplication>
 
+#include <random>
+
 #define SER_HOSTS "hosts"
 
 class PcMonitorThread : public QThread
@@ -826,4 +828,14 @@ void ComputerManager::addNewHost(NvAddress address, bool mdns, NvAddress mdnsIpv
     QThreadPool::globalInstance()->start(addTask);
 }
 
+// TODO: Use QRandomGenerator when we drop Qt 5.9 support
+QString ComputerManager::generatePinString()
+{
+    std::uniform_int_distribution<int> dist(0, 9999);
+    std::random_device rd;
+    std::mt19937 engine(rd());
+
+    return QString::asprintf("%04u", dist(engine));
+}
+
 #include "computermanager.moc"

app/backend/computermanager.h

@@ -181,6 +181,8 @@ public:
 
     void addNewHost(NvAddress address, bool mdns, NvAddress mdnsIpv6Address = NvAddress());
 
+    QString generatePinString();
+
     void pairHost(NvComputer* computer, QString pin);
 
     void quitRunningApp(NvComputer* computer);

app/gui/computermodel.cpp

@@ -2,8 +2,6 @@
 
 #include <QThreadPool>
 
-#include <random>
-
 ComputerModel::ComputerModel(QObject* object)
     : QAbstractListModel(object) {}
 
@@ -140,14 +138,9 @@ void ComputerModel::renameComputer(int computerIndex, QString name)
     m_ComputerManager->renameHost(m_Computers[computerIndex], name);
 }
 
-// TODO: Use QRandomGenerator when we drop Qt 5.9 support
 QString ComputerModel::generatePinString()
 {
-    std::uniform_int_distribution<int> dist(0, 9999);
-    std::random_device rd;
-    std::mt19937 engine(rd());
-
-    return QString::asprintf("%04u", dist(engine));
+    return m_ComputerManager->generatePinString();
 }
 
 class DeferredTestConnectionTask : public QObject, public QRunnable