Cannot use multiple windows for the same project

[jclaveau]

When a project is opened and you want to compare to files (typically during a refacto), the "right click on tab -> open in a new window" feature is really sweet but the new window don't belong to the project of the previous one.

Because of it, useful features "like search in project's symbols" or type of indentation (space or tabs) which are related to the project won't work.