Avoid expanding QRC nodes in main thread

For CMake and Qbs projects and users of TreeScanner, where the tree is
already created in a separate thread.

Expanding the QRC nodes means reading and parsing the QRC files, which
can take up a considerable time (second(s)) if there are hundreds of
them in a larger project like Qt Creator.

Task-number: QTCREATORBUG-25783
Change-Id: I5ca818b9f75ea6e8ef23f837cc9e15df7e6630e1
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cmakeprojectmanager/fileapidataextractor.cpp

@@ -33,6 +33,8 @@
 #include <utils/qtcprocess.h>
 #include <utils/utilsicons.h>
 
+#include <projectexplorer/projecttree.h>
+
 #include <QDir>
 
 using namespace ProjectExplorer;
@@ -708,6 +710,7 @@ FileApiQtcData extractData(FileApiData &input,
     result.projectParts = generateRawProjectParts(data, sourceDirectory);
 
     auto pair = generateRootProjectNode(data, sourceDirectory, buildDirectory);
+    ProjectTree::applyTreeManager(pair.first.get()); // QRC nodes
     result.rootProjectNode = std::move(pair.first);
     result.knownHeaders = std::move(pair.second);
 

src/plugins/projectexplorer/projecttree.cpp

@@ -391,6 +391,11 @@ void ProjectTree::highlightProject(Project *project, const QString &message)
         projectTreeWidget->showMessage(project->rootProjectNode(), message);
 }
 
+/*!
+    Registers the function \a treeChange to be run on a (sub tree of the)
+    project tree when it is created. The function must be thread-safe, and
+    applying the function on the same tree a second time must be a no-op.
+*/
 void ProjectTree::registerTreeManager(const TreeManagerFunction &treeChange)
 {
     if (treeChange)

src/plugins/projectexplorer/treescanner.cpp

@@ -27,6 +27,7 @@
 
 #include "projectexplorerconstants.h"
 #include "projectnodeshelper.h"
+#include "projecttree.h"
 
 #include <coreplugin/iversioncontrol.h>
 #include <coreplugin/vcsmanager.h>
@@ -158,6 +159,7 @@ static std::unique_ptr<FolderNode> createFolderNode(const Utils::FilePath &direc
         std::unique_ptr<FileNode> node(fn->clone());
         fileSystemNode->addNestedNode(std::move(node));
     }
+    ProjectTree::applyTreeManager(fileSystemNode.get()); // QRC nodes
     return fileSystemNode;
 }
 

src/plugins/qbsprojectmanager/qbsnodetreebuilder.cpp

@@ -36,6 +36,8 @@
 #include <utils/algorithm.h>
 #include <utils/qtcassert.h>
 
+#include <projectexplorer/projecttree.h>
+
 using namespace ProjectExplorer;
 using namespace Utils;
 
@@ -230,6 +232,7 @@ QbsProjectNode *QbsNodeTreeBuilder::buildTree(const QString &projectName,
     }
     buildSystemFiles->compress();
     root->addNode(std::move(buildSystemFiles));
+    ProjectTree::applyTreeManager(root.get()); // QRC nodes
     return root.release();
 }