Last modified: 2013-04-26 23:54:10 UTC
e.g. inserting a <p>Bar</p> into <p>Foo</p> after the last 'o' results in: <p>Foo</p><p>Bar</p><p></p> The original paragraph is split, then the Bar is inserted, then the paragraph is reopened again. Or in transaction terms: insert: '<p>Bar</p>' coverts to insert: </p><p>Bar</p><p>'
For some reason the bug isn't reporting this: https://gerrit.wikimedia.org/r/#/c/61048/ addresses this and is waiting for jenkins-bot to merge it.
Gerrit change #61048 is now merged; marking as fixed - will go out in Monday's deploy train.