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The existence of two concepts - (1) single code model for a library (say, /usr/include) for all projects and (2) not reparsing headers results in the fact, that code model for a project depends on the order of the projects opened. The situation is aggravated by the fact that libraries model persist on disk.
Well, I couldn't find a convincing example at once, so I'm downgrading this to P4. (Though my intuition is that it will eventually be at least P3, as soon as we face a real-world problem with this)
after changing (2) not reparsing headers into (2) reparse headers with different models this issue was solved