I reported this, and received an email from Marius Vollmer at Nokia, who said:

Yes, this has been fixed in trunk: now there is only one column that has
the name left-justified and the version right-justified in it. Thus,
long versions do not take space away from all packages.

To fix it in your case, you should probably disable the "Show all
packages" option in red-pill mode. Then xserver-xomap will not be
listed at all in the Application Manager.