When a long string (24 characters or more) gets added in the link tool (a typical long URL, or a just a long article title), the external and internal link options get shortened with "..." in the middle. This can make it hard to know whether you put in the right string or not, and there doesn't seem to be much downside to displaying the full link targets for at least moderately longer strings.
Version: unspecified
Severity: minor
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=69574