StudioWelcome: Avoid opening two projects on double click

This issue was introdced because we do not go to the edit mode after
opening a project. We stay in the WelcomeMode until the project is
loaded. Since the recent project list did change a second click
(aka double click) will open a second project.

We now block the update of the model for 1000ms and also block opening another
project for the same duration.

Task-number: QDS-6286
Change-Id: I52ed6aa3686594b63fe4a6134c6db1287bca1dcb
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>

src/plugins/studiowelcome/studiowelcomeplugin.cpp

@@ -224,9 +224,15 @@ public:
 
     Q_INVOKABLE void openProjectAt(int row)
     {
+        if (m_blockOpenRecent)
+            return;
+
+        m_blockOpenRecent = true;
         const QString projectFile = data(index(row, 0), ProjectModel::FilePathRole).toString();
         if (QFileInfo::exists(projectFile))
             ProjectExplorer::ProjectExplorerPlugin::openProjectWelcomePage(projectFile);
+
+        resetProjects();
     }
 
     Q_INVOKABLE int get(int) { return -1; }
@@ -311,6 +317,7 @@ private:
 
     bool m_communityVersion = true;
     bool m_enterpriseVersion = false;
+    bool m_blockOpenRecent = false;
 };
 
 void ProjectModel::setupVersion()
@@ -520,8 +527,11 @@ QHash<int, QByteArray> ProjectModel::roleNames() const
 
 void ProjectModel::resetProjects()
 {
+    QTimer::singleShot(2000, this, [this]() {
         beginResetModel();
         endResetModel();
+        m_blockOpenRecent = false;
+    });
 }
 
 class WelcomeMode : public Core::IMode