Fix a crash on codestylesettings

Task-number: QTCREATORBUG-10235

Instead of rely on ICodeStylePreferences::destroyed() signal,
when all other objects might be in destruction phase,
clear project code style settings explicitly, when project
closes.

Change-Id: I0dd6675d54c5495d4006acbc9ad12c95f1d0a00c
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Jarek Kobus <jaroslaw.kobus@digia.com>

src/plugins/projectexplorer/editorconfiguration.cpp

@@ -33,6 +33,7 @@
 #include "project.h"
 
 #include <coreplugin/id.h>
+#include <coreplugin/icore.h>
 #include <texteditor/basetexteditor.h>
 #include <texteditor/texteditorsettings.h>
 #include <texteditor/simplecodestylepreferences.h>
@@ -91,22 +92,32 @@ EditorConfiguration::EditorConfiguration() : d(new EditorConfigurationPrivate)
     while (itCodeStyle.hasNext()) {
         itCodeStyle.next();
         Core::Id languageId = itCodeStyle.key();
+        // global prefs for language
         ICodeStylePreferences *originalPreferences = itCodeStyle.value();
         ICodeStylePreferencesFactory *factory = textEditorSettings->codeStyleFactory(languageId);
+        // clone of global prefs for language - it will became project prefs for language
         ICodeStylePreferences *preferences = factory->createCodeStyle();
+        // project prefs can point to the global language pool, which contains also the global language prefs
         preferences->setDelegatingPool(textEditorSettings->codeStylePool(languageId));
         preferences->setId(languageId.toString() + QLatin1String("Project"));
         preferences->setDisplayName(tr("Project %1", "Settings, %1 is a language (C++ or QML)").arg(factory->displayName()));
+        // project prefs by default point to global prefs (which in turn can delegate to anything else or not)
         preferences->setCurrentDelegate(originalPreferences);
         d->m_languageCodeStylePreferences.insert(languageId, preferences);
     }
 
+    // clone of global prefs (not language specific), for project scope
     d->m_defaultCodeStyle = new SimpleCodeStylePreferences(this);
     d->m_defaultCodeStyle->setDelegatingPool(textEditorSettings->codeStylePool());
     d->m_defaultCodeStyle->setDisplayName(tr("Project", "Settings"));
     d->m_defaultCodeStyle->setId(kId);
+    // if setCurrentDelegate is 0 values are read from *this prefs
     d->m_defaultCodeStyle->setCurrentDelegate(d->m_useGlobal
                     ? TextEditorSettings::instance()->codeStyle() : 0);
+
+    const SessionManager *session = ProjectExplorerPlugin::instance()->session();
+    connect(session, SIGNAL(aboutToRemoveProject(ProjectExplorer::Project*)),
+            this, SLOT(slotAboutToRemoveProject(ProjectExplorer::Project*)));
 }
 
 EditorConfiguration::~EditorConfiguration()
@@ -243,6 +254,15 @@ void EditorConfiguration::configureEditor(ITextEditor *textEditor) const
     }
 }
 
+void EditorConfiguration::deconfigureEditor(ITextEditor *textEditor) const
+{
+    BaseTextEditorWidget *baseTextEditor = qobject_cast<BaseTextEditorWidget *>(textEditor->widget());
+    if (baseTextEditor)
+        baseTextEditor->setCodeStyle(TextEditorSettings::instance()->codeStyle(baseTextEditor->languageSettingsId()));
+
+    // TODO: what about text codec and switching settings?
+}
+
 void EditorConfiguration::setUseGlobalSettings(bool use)
 {
     d->m_useGlobal = use;
@@ -325,6 +345,27 @@ void EditorConfiguration::setTextCodec(QTextCodec *textCodec)
     d->m_textCodec = textCodec;
 }
 
+void EditorConfiguration::slotAboutToRemoveProject(ProjectExplorer::Project *project)
+{
+    if (project->editorConfiguration() != this)
+        return;
+
+    Core::EditorManager *em = Core::ICore::editorManager();
+    const SessionManager *session = ProjectExplorerPlugin::instance()->session();
+    QList<Core::IEditor*> editors = em->openedEditors();
+    for (int i = 0; i < editors.count(); i++) {
+        Core::IEditor *editor = editors.at(i);
+        if (TextEditor::ITextEditor *textEditor = qobject_cast<TextEditor::ITextEditor*>(editor)) {
+            Core::IDocument *document = editor->document();
+            if (document) {
+                Project *editorProject = session->projectForFile(document->fileName());
+                if (project == editorProject)
+                    deconfigureEditor(textEditor);
+            }
+        }
+    }
+}
+
 TabSettings actualTabSettings(const QString &fileName,
                                      const BaseTextEditorWidget *baseTextEditor)
 {

src/plugins/projectexplorer/editorconfiguration.h

@@ -50,6 +50,7 @@ class ExtraEncodingSettings;
 
 namespace ProjectExplorer {
 
+class Project;
 struct EditorConfigurationPrivate;
 
 class PROJECTEXPLORER_EXPORT EditorConfiguration : public QObject
@@ -77,6 +78,7 @@ public:
     QMap<Core::Id, TextEditor::ICodeStylePreferences *> codeStyles() const;
 
     void configureEditor(TextEditor::ITextEditor *textEditor) const;
+    void deconfigureEditor(TextEditor::ITextEditor *textEditor) const;
 
     QVariantMap toMap() const;
     void fromMap(const QVariantMap &map);
@@ -96,6 +98,7 @@ private slots:
 
     void setTextCodec(QTextCodec *textCodec);
 
+    void slotAboutToRemoveProject(ProjectExplorer::Project *project);
 private:
     void switchSettings(TextEditor::BaseTextEditorWidget *baseTextEditor) const;
     template <class NewSenderT, class OldSenderT>

src/plugins/texteditor/basetexteditor.cpp

@@ -4623,8 +4623,6 @@ void BaseTextEditorWidget::setCodeStyle(ICodeStylePreferences *preferences)
                 this, SLOT(setTabSettings(TextEditor::TabSettings)));
         disconnect(d->m_codeStylePreferences, SIGNAL(currentValueChanged(QVariant)),
                 this, SLOT(slotCodeStyleSettingsChanged(QVariant)));
-        disconnect(d->m_codeStylePreferences, SIGNAL(destroyed()),
-                   this, SLOT(onCodeStylePreferencesDestroyed()));
     }
     d->m_codeStylePreferences = preferences;
     if (d->m_codeStylePreferences) {
@@ -4632,25 +4630,11 @@ void BaseTextEditorWidget::setCodeStyle(ICodeStylePreferences *preferences)
                 this, SLOT(setTabSettings(TextEditor::TabSettings)));
         connect(d->m_codeStylePreferences, SIGNAL(currentValueChanged(QVariant)),
                 this, SLOT(slotCodeStyleSettingsChanged(QVariant)));
-        connect(d->m_codeStylePreferences, SIGNAL(destroyed()),
-                this, SLOT(onCodeStylePreferencesDestroyed()));
         setTabSettings(d->m_codeStylePreferences->currentTabSettings());
         slotCodeStyleSettingsChanged(d->m_codeStylePreferences->currentValue());
     }
 }
 
-void BaseTextEditorWidget::onCodeStylePreferencesDestroyed()
-{
-    if (sender() != d->m_codeStylePreferences)
-        return;
-    ICodeStylePreferences *prefs = TextEditorSettings::instance()->codeStyle(languageSettingsId());
-    if (prefs == d->m_codeStylePreferences)
-        prefs = 0;
-    // avoid failing disconnects, m_codeStylePreferences has already been reduced to QObject
-    d->m_codeStylePreferences = 0;
-    setCodeStyle(prefs);
-}
-
 void BaseTextEditorWidget::slotCodeStyleSettingsChanged(const QVariant &)
 {
 

src/plugins/texteditor/basetexteditor.h

@@ -381,7 +381,6 @@ private slots:
     bool inFindScope(const QTextCursor &cursor);
     bool inFindScope(int selectionStart, int selectionEnd);
     void inSnippetMode(bool *active);
-    void onCodeStylePreferencesDestroyed();
 
 private:
     Internal::BaseTextEditorWidgetPrivate *d;