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4209c8150a
... Now new project windows are opened when .aup3 files are opened; but behavior chages only in that case. Wherever opening of other files invoked import code, we still do or do not make a new project in exactly the same cases as before; such as, when opening multiple files with File > Open, be sure each imported file still opens in its own separate window. This means the decision whether to open a new project must be lowered into ProjectFileManager, where the type of the file is discovered, and we pass it a function object so it avoids a dependency cycle with ProjectManager. It also means the checking for errors and closing of new projects in case of failure must be replicated at all places where ProjectFileManager::OpenProject is called directly. The class ProjectManager::ProjectChooser simplifies this. Recently introduced calls to SafeToOpenProjectInto(), before ProjectManager::OpenProject(), are now lowered into that class, delaying the safety check so it might also be called where ProjectFileManager is used directly.