I noticed that in IE 8 the relations (the colored lines) are only drawn in designer if the compatibity mode is on and not otherwise.
The main issue here was iecanvas.js not being updated to the ajax page loading mechanism. This is fixes with https://github.com/phpmyadmin/phpmyadmin/commit/e49e9d82bddebb7edac0d9879766bc20be1e2d74. However, VML lines would not still draw. This needs to be investigated further.
does this still apply to the current version? If so, please update the milestone.
Yes, it seems to apply to the current stable version as well
I'm not sure whether a fix is worth the effort for this older version of IE
IE8 market share currently is 2.12%, I would agree with Madhura Jayaratne :)
or 1.1 % source: http://www.w3schools.com/browsers/browsers_explorer.asp