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I use the Go to Declaration feature a lot, but now I am frequently seeing the error, "File is already open in another project." I do have multiple projects open that contain the same source files, but this shouldn't prevent me from navigating.
Hm, it's a limitation of 'linked' files and not of go to declaration.
A file can only be open in one project at a time - or too many things won't work.
Linked files are problematic.
However maybe I can 'switch' the project of open documents for go to declaration. But when using linked files the user should be 'aware' of the problems behind that.
I think I've found a working solution.