The commit messages in the changes view began to be truncated at some recent version of the Git plugin.

This problem can be seen in Problem1.png where the commit messages are truncated. In Problem2.png you can see that the full message is available but it appears that there is a newline in there. Correct.png is a screenshot of an older version (not entirely sure which, it's from Apache's Jenkins server) where the same commit is correctly displayed.

This does not only affect display but also the E-Mail notifications that are sent making them relatively useless.

There is - as far as I know - no workaround hence I marked it as major and not as minor.