Source::parsed is now std::atomic to avoid undefined behaviour

src/source.cc

@@ -114,7 +114,7 @@ std::string Source::FixIt::string(const Glib::RefPtr<Gtk::TextBuffer> &buffer) {
 std::unordered_set<Source::View*> Source::View::non_deleted_views;
 std::unordered_set<Source::View*> Source::View::views;
 
-Source::View::View(const boost::filesystem::path &file_path, const Glib::RefPtr<Gsv::Language> &language, bool is_generic_view): BaseView(file_path, language), SpellCheckView(file_path, language), DiffView(file_path, language) {
+Source::View::View(const boost::filesystem::path &file_path, const Glib::RefPtr<Gsv::Language> &language, bool is_generic_view): BaseView(file_path, language), SpellCheckView(file_path, language), DiffView(file_path, language), parsed(true) {
   non_deleted_views.emplace(this);
   views.emplace(this);
   

src/source.h

@@ -99,7 +99,7 @@ namespace Source {
     virtual void soft_reparse(bool delayed=false) {soft_reparse_needed=false;}
     virtual void full_reparse() {full_reparse_needed=false;}
   protected:
-    bool parsed=true;
+    std::atomic<bool> parsed;
     Tooltips diagnostic_tooltips;
     Tooltips type_tooltips;
     sigc::connection delayed_tooltips_connection;