contao/core — pull request #5581 by xchs (2013-03-31 20:17:33+00:00)
Title: Escape ampersand characters to the corresponding entity in the `Versions` class

In the `Versions` class, one ampersand character in the generated URL ("ShowDifferences") has not been escaped to the corresponding HTML entity `&`. This PR fixes the issue thus making the generated HTML markup valid again.