Fix can't get wallpaper when logging in

https://github.com/cutefishos/core/issues/1

session/application.h

@@ -56,6 +56,11 @@ public slots:
         m_power.suspend();
     }
 
+    void startDesktopProcess()
+    {
+        m_processManager->startDesktopProcess();
+    }
+
 private:
     void initEnvironments();
     void initLanguage();

session/org.cutefish.Session.xml

@@ -13,5 +13,8 @@
     <method name="suspend">
       <annotation name="org.freedesktop.DBus.Method.NoReply" value="true"/>
     </method>
+    <method name="startDesktopProcess">
+      <annotation name="org.freedesktop.DBus.Method.NoReply" value="true"/>
+    </method>
   </interface>
 </node>

session/processmanager.cpp

@@ -57,7 +57,7 @@ ProcessManager::~ProcessManager()
 void ProcessManager::start()
 {
     startWindowManager();
-    loadSystemProcess();
+    startDaemonProcess();
 
     QTimer::singleShot(100, this, &ProcessManager::loadAutoStartProcess);
 }
@@ -97,12 +97,12 @@ void ProcessManager::startWindowManager()
     m_waitLoop = nullptr;
 }
 
-void ProcessManager::loadSystemProcess()
+void ProcessManager::startDesktopProcess()
 {
-    QList<QPair<QString, QStringList>> list;
-    list << qMakePair(QString("cutefish-settings-daemon"), QStringList());
-    list << qMakePair(QString("cutefish-xembedsniproxy"), QStringList());
+    // When the cutefish-settings-daemon theme module is loaded, start the desktop.
+    // In the way, there will be no problem that desktop and launcher can't get wallpaper.
 
+    QList<QPair<QString, QStringList>> list;
     // Desktop components
     list << qMakePair(QString("cutefish-filemanager"), QStringList("--desktop"));
     list << qMakePair(QString("cutefish-statusbar"), QStringList());
@@ -117,11 +117,30 @@ void ProcessManager::loadSystemProcess()
         process->start();
         process->waitForStarted();
 
-        if (pair.first == "cutefish-settings-daemon") {
-            QThread::msleep(800);
+        qDebug() << "Load DE components: " << pair.first << pair.second;
+
+        // Add to map
+        if (process->exitCode() == 0) {
+            m_autoStartProcess.insert(pair.first, process);
+        } else {
+            process->deleteLater();
         }
+    }
+}
 
-        qDebug() << "Load DE components: " << pair.first << pair.second;
+void ProcessManager::startDaemonProcess()
+{
+    QList<QPair<QString, QStringList>> list;
+    list << qMakePair(QString("cutefish-settings-daemon"), QStringList());
+    list << qMakePair(QString("cutefish-xembedsniproxy"), QStringList());
+
+    for (QPair<QString, QStringList> pair : list) {
+        QProcess *process = new QProcess;
+        process->setProcessChannelMode(QProcess::ForwardedChannels);
+        process->setProgram(pair.first);
+        process->setArguments(pair.second);
+        process->start();
+        process->waitForStarted();
 
         // Add to map
         if (process->exitCode() == 0) {

session/processmanager.h

@@ -38,7 +38,8 @@ public:
     void logout();
 
     void startWindowManager();
-    void loadSystemProcess();
+    void startDesktopProcess();
+    void startDaemonProcess();
     void loadAutoStartProcess();
 
     bool nativeEventFilter(const QByteArray & eventType, void * message, long * result) override;

settings-daemon/theme/thememanager.cpp

@@ -19,6 +19,8 @@
 
 #include "thememanager.h"
 #include "themeadaptor.h"
+
+#include <QDBusInterface>
 #include <QFile>
 #include <QDebug>
 
@@ -64,6 +66,13 @@ ThemeManager::ThemeManager(QObject *parent)
 
     // Start the DE and need to update the settings again.
     initGtkConfig();
+
+    // Start desktop UI component.
+    QDBusInterface sessionInterface("org.cutefish.Session", "/Session", "org.cutefish.Session",
+                                    QDBusConnection::sessionBus());
+    if (sessionInterface.isValid()) {
+        sessionInterface.call("startDesktopProcess");
+    }
 }
 
 bool ThemeManager::isDarkMode()