Qbs: Send fileListChanged signal later

Only send the fileListChanged signal at a point where the files()
method will actually return a non-empty list of files.

This fixes one reported issue with the Qbs project, but should
actually fix more than that: The files() list is used in several
places.

Task-number: QTCREATORBUG-15112
Change-Id: I2c8207dccfb70d79f50eb65caba88b1a6a11a071
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/plugins/qbsprojectmanager/qbsproject.cpp

@@ -454,13 +454,19 @@ void QbsProject::handleQbsParsingDone(bool success)
 
     generateErrors(m_qbsProjectParser->error());
 
+    bool dataChanged = false;
     if (success) {
         m_qbsProject = m_qbsProjectParser->qbsProject();
         const qbs::ProjectData &projectData = m_qbsProject.projectData();
         QTC_CHECK(m_qbsProject.isValid());
+
         if (projectData != m_projectData) {
             m_projectData = projectData;
-            readQbsData();
+            m_rootProjectNode->update();
+
+            updateDocuments(m_qbsProject.isValid()
+                            ? m_qbsProject.buildSystemFiles() : QSet<QString>() << m_fileName);
+            dataChanged = true;
         }
     } else {
         m_qbsUpdateFutureInterface->reportCanceled();
@@ -475,6 +481,13 @@ void QbsProject::handleQbsParsingDone(bool success)
         m_qbsUpdateFutureInterface = 0;
     }
 
+    if (dataChanged) { // Do this now when isParsing() is false!
+        updateCppCodeModel();
+        updateQmlJsCodeModel();
+        updateBuildTargetData();
+
+        emit fileListChanged();
+    }
     emit projectParsingDone(success);
 }
 
@@ -524,23 +537,6 @@ void QbsProject::delayParsing()
     m_parsingDelay.start();
 }
 
-// Qbs may change its data
-void QbsProject::readQbsData()
-{
-    QTC_ASSERT(m_rootProjectNode, return);
-
-    m_rootProjectNode->update();
-
-    updateDocuments(m_qbsProject.isValid()
-                    ? m_qbsProject.buildSystemFiles() : QSet<QString>() << m_fileName);
-
-    updateCppCodeModel();
-    updateQmlJsCodeModel();
-    updateBuildTargetData();
-
-    emit fileListChanged();
-}
-
 void QbsProject::parseCurrentBuildConfiguration()
 {
     m_parsingScheduled = false;

src/plugins/qbsprojectmanager/qbsproject.h

@@ -114,7 +114,6 @@ public:
 public slots:
     void invalidate();
     void delayParsing();
-    void readQbsData();
 
 signals:
     void projectParsingStarted();