Bug in user path replacement in stacktrace

[akosuas]

My home directory, /home/akosuas, is a symlink to /data/home/akosuas.

In 1.6, the new stacktrace printing is broken when the code is being run from /data/home/akosuas. It prints paths like:

....
 [5] top-level scope
  @ /data~/foo/bar

Because it is doing a replace("/data/home/akosuas", "/home/akosuas" => "~") rather than a prefix-replace:
https://github.com/JuliaLang/julia/blob/master/base/errorshow.jl#L556

At minimum, it would be nice to avoid this bug. Even better, perhaps, would be to resolve whether any prefix of the path, after resolving symlinks, is the home directory.

[fredrikekre]

There is a Base.contractuser function for this.