If you protect a page or move a page, you often want to give detailed reasons for that, and unfortunately if your comment is too long, it is cut off and not fully saved in the history[1]. Editing a page solve this problem through a maxlength="200" in the input-tag. There does not seem to be a limit in the forms of page moves and page protections.
[1] see these examples:
http://de.wikipedia.org/w/index.php?title=Benutzer%3AChurch_of_emacs%2FTestseite&diff=55039106&oldid=54976709&uselang=en
http://de.wikipedia.org/w/index.php?title=Benutzer%3AChurch_of_emacs%2FTestseite3&diff=55039224&oldid=55039106&uselang=en
Version: unspecified
Severity: normal