Long exception messages look bad in Terminal

[mottosso]

Problem

When passing a long description of an exception, the expanded version of an item in the Terminal draws badly.

Suggested solution

The Terminal delegate does not take into account the length of the data it includes in an expanded item. We'll need to parse the information and determine their actual sized. We may also take this opportunity to lay them out a bit nicer.

[mottosso]

Expanding items were replaced by middle-click details view, but the problem still remains.

Formatting long strings, especially docstrings, is a tricky subject.