CppTools: Use fallback project part if project is closed

...instead of sticking to the old one.

If a project is closed, the editor should reflect that. It also simplifies the code.

Change-Id: I9b8a94513d3b06a238cfc4ee60c11c0d0da3d93f
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/cpptools/baseeditordocumentparser.cpp

@@ -122,7 +122,7 @@ BaseEditorDocumentParser::Ptr BaseEditorDocumentParser::get(const QString &fileP
 ProjectPartInfo BaseEditorDocumentParser::determineProjectPart(
         const QString &filePath,
         const Configuration &config,
-        const State &state,
+        const ProjectPartInfo &currentProjectPartInfo,
         const ProjectExplorer::Project *activeProject,
         Language languagePreference,
         bool hasActiveProjectChanged)
@@ -143,9 +143,8 @@ ProjectPartInfo BaseEditorDocumentParser::determineProjectPart(
 
     const ProjectPartInfo chooserResult
             = chooser.choose(filePath,
-                             state.projectPartInfo.projectPart,
+                             currentProjectPartInfo,
                              config.manuallySetProjectPart,
-                             config.stickToPreviousProjectPart,
                              activeProject,
                              languagePreference,
                              hasActiveProjectChanged);

src/plugins/cpptools/baseeditordocumentparser.h

@@ -47,7 +47,6 @@ public:
     static Ptr get(const QString &filePath);
 
     struct Configuration {
-        bool stickToPreviousProjectPart = true;
         bool usePrecompiledHeaders = false;
         QByteArray editorDefines;
         ProjectPart::Ptr manuallySetProjectPart;
@@ -95,10 +94,9 @@ protected:
     State state() const;
     void setState(const State &state);
 
-    static ProjectPartInfo determineProjectPart(
-            const QString &filePath,
+    static ProjectPartInfo determineProjectPart(const QString &filePath,
             const Configuration &config,
-            const State &state,
+            const ProjectPartInfo &currentProjectPartInfo,
             const ProjectExplorer::Project *activeProject,
             Language languagePreference,
             bool hasActiveProjectChanged);

src/plugins/cpptools/builtineditordocumentparser.cpp

@@ -79,7 +79,7 @@ void BuiltinEditorDocumentParser::updateImpl(const QFutureInterface<void> &futur
 
     baseState.projectPartInfo = determineProjectPart(filePath(),
                                                     baseConfig,
-                                                    baseState,
+                                                    baseState.projectPartInfo,
                                                     updateParams.activeProject,
                                                     updateParams.languagePreference,
                                                     updateParams.hasActiveProjectChanged);

src/plugins/cpptools/cppprojectpartchooser.cpp

@@ -124,9 +124,8 @@ private:
 
 ProjectPartInfo ProjectPartChooser::choose(
         const QString &filePath,
-        const ProjectPart::Ptr &currentProjectPart,
+        const ProjectPartInfo &currentProjectPartInfo,
         const ProjectPart::Ptr &manuallySetProjectPart,
-        bool stickToPreviousProjectPart,
         const ProjectExplorer::Project *activeProject,
         Language languagePreference,
         bool projectHasChanged) const
@@ -138,15 +137,14 @@ ProjectPartInfo ProjectPartChooser::choose(
     if (manuallySetProjectPart)
         return {manuallySetProjectPart, ProjectPartInfo::NoHint};
 
-    ProjectPart::Ptr projectPart = currentProjectPart;
+    ProjectPart::Ptr projectPart = currentProjectPartInfo.projectPart;
     ProjectPartInfo::Hint hint = ProjectPartInfo::NoHint;
 
     QList<ProjectPart::Ptr> projectParts = m_projectPartsForFile(filePath);
     if (projectParts.isEmpty()) {
-        if (projectPart && stickToPreviousProjectPart)
-            // File is not directly part of any project, but we got one before. We will re-use it,
-            // because re-calculating this can be expensive when the dependency table is big.
-            return {projectPart, ProjectPartInfo::NoHint};
+        if (projectPart && currentProjectPartInfo.hint == ProjectPartInfo::IsFallbackMatch)
+            // Avoid re-calculating the expensive dependency table for non-project files.
+            return {projectPart, ProjectPartInfo::IsFallbackMatch};
 
         // Fall-back step 1: Get some parts through the dependency table:
         projectParts = m_projectPartsFromDependenciesForFile(filePath);

src/plugins/cpptools/cppprojectpartchooser.h

@@ -50,9 +50,8 @@ public:
 
     ProjectPartInfo choose(
             const QString &filePath,
-            const ProjectPart::Ptr &currentProjectPart,
+            const ProjectPartInfo &currentProjectPartInfo,
             const ProjectPart::Ptr &manuallySetProjectPart,
-            bool stickToPreviousProjectPart,
             const ProjectExplorer::Project *activeProject,
             Language languagePreference,
             bool projectHasChanged) const;