I am working in a project that has many folders corresponding to real directories. After working for a while, there may be some folders that are expanded and others that are collapsed. The thing is that if I close the project and open it again later, then all of the folders will be collapsed. This is very annoying because I must expand all the folders I want access to every time I work on the project. Is there a way for TextMate to maintain the state of which folders are expanded and which are not the next time I open the project?