QbsProjectManager: Disable build and clean actions during parsing

The qbs-specific actions such as "build file", "build product" and
"clean product" were not properly updated on parse status changes, so
they would stay enabled during a parse, leading to user confusion about
why nothing happened when clicking them.

Fixes: QTCREATORBUG-24129
Change-Id: Ia19052e287f0ce1d965332e8ccd9efb46c8d005e
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/qbsprojectmanager/qbsprojectmanagerplugin.cpp

@@ -254,6 +254,13 @@ bool QbsProjectManagerPlugin::initialize(const QStringList &arguments, QString *
             this, &QbsProjectManagerPlugin::updateBuildActions);
     connect(SessionManager::instance(), &SessionManager::startupProjectChanged,
             this, &QbsProjectManagerPlugin::updateReparseQbsAction);
+    connect(SessionManager::instance(), &SessionManager::projectAdded,
+            this, [this](Project *project) {
+        connect(project, &Project::anyParsingStarted,
+                this, &QbsProjectManagerPlugin::projectChanged);
+        connect(project, &Project::anyParsingFinished,
+                this, &QbsProjectManagerPlugin::projectChanged);
+    });
 
     // Run initial setup routines
     updateContextActions();