Here I have uploaded a short video of the work in progress.
It shows a new “Frinedly Messages” toolwindow, that finally obeys dark/light IJ appearance and correct scrolling (it is Html and wrapping makes no sense anyway because of the error markers from the tools).
After running a tool (be it the Elm compiler or in this case elm-review), you can navigate immediately through the messages by the conventional IJ shortcuts (next/prev occurence).
I think, this gives a better area for the report-messages. There could be a setting, to not show the new messages window at all of course.
Let me know what you think.
Btw, this runs in the most current version of IntelliJ and is a Lamdera project