Last modified: 2014-06-30 15:27:29 UTC
r87339 is marked as TODO, but just to have a bug for it: 100 characters are really short, especially when you want to enter an URL to document deletions due to copyright violations. I used Web Developer to disable the maxlength and succeeded to put in approximately 250 bytes (as expected), so the length should increase.
See the script on http://de.wikipedia.beta.wmflabs.org/w/index.php?title=MediaWiki:Group-sysop.js&oldid=1995 for a possible solution.
Change 135197 had a related patch set uploaded by Umherirrender: Add dynamic maxlength to Special:RevisionDelete https://gerrit.wikimedia.org/r/135197