Julia vscode stop working when there are many source file and include statements

Hi David,

So after investigation I found that if I have included any file more than once, the language server will just stuck (but there is no cyclic include there). I have now change to include all the file in my main file only, and everything just works.

Before (stuck)

Main.jl
include("File1.jl")
include("File2.jl")

File1.jl
include("File2.jl")

File2.jl
...

Now (not stuck)

Main.jl
include("File1.jl")
include("File2.jl")

File1.jl
...

File2.jl
...