Some browsers, including Firefox 3.5, select the trailing space when double-clicking on a word. (I think some version of IE selects trailing newlines too, but I don't have them around to check.) The link dialog then includes this in the text, so you get something like "((foo ))bar" instead of "((foo)) bar" (I use ( instead of [ to avoid bugzilla auto-linking). It is a minor annoyance, but should be an easy fix.
Version: unspecified
Severity: enhancement