I'm using Eclipse with Scala plugin and every time I do something like
val blah = "test"
And press Enter the IDE automatically indents the following line. I'm wondering if this is a coding convention or some weird IDE quirk.
It's definitely just a small bug in Scala-IDE. The plugin has a lot of little formatting issues.
However, if you want your life to be awesome then you can hit CTRL+SHIFT+F (CMD+SHIFT+F on mac) and it will automatically format your code and correct those little issues.
EDIT: By the way, it seems there are a couple of tickets out for this issue. See this and this. I added a comment about this precise issue to one of them, so hopefully it's in the queue to get fixed.