Comment 21 for bug 216550

It also fixes the behavior of the "Maximize Window Vertically" operation. With 3-D it maximizes, but repeating does not restore the original size. With 2-D the operation toggles, which is arguably a better behavior.

By the way, by "logging in with the 2-D session" I mean logging out, then before logging back in using the menu which appears when you click the unity symbol to choose a 2-D session.