VCS: Do not increase the number of VCSes in ProjectLoadWizard

Do not increase the number of VCSes by readding the same entries when going
back/next on the summary page of the project load wizard.

Task-number: QTCREATORBUG-5519
Change-Id: I60058cf2060fae4e5703e77fe97a727108bbc8c8
Reviewed-on: http://codereview.qt.nokia.com/2283


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Robert Löhning <robert.loehning@nokia.com>

src/plugins/projectexplorer/projectfilewizardextension.cpp

@@ -302,9 +302,11 @@ void ProjectFileWizardExtension::firstExtensionPageShown(
     }
 
     // Store all version controls for later use:
-    foreach (Core::IVersionControl *vc, ExtensionSystem::PluginManager::instance()->getObjects<Core::IVersionControl>()) {
-        m_context->versionControls.append(vc);
-        connect(vc, SIGNAL(configurationChanged()), this, SLOT(initializeVersionControlChoices()));
+    if (m_context->versionControls.isEmpty()) {
+        foreach (Core::IVersionControl *vc, ExtensionSystem::PluginManager::instance()->getObjects<Core::IVersionControl>()) {
+            m_context->versionControls.append(vc);
+            connect(vc, SIGNAL(configurationChanged()), this, SLOT(initializeVersionControlChoices()));
+        }
     }
 
     initializeVersionControlChoices();