Critical GUI.TextArea bug on OSX still hasn't been fixed after 4 major versions

I've been waiting patiently for this issue to be looked at for the best part of a year, but nothing seems to be happening:

https://fogbugz.unity3d.com/default.asp?736800_pb8fp1nkoqogi9s8

We have a released MMO that was built on unity GUI (work on the game predated the new ui system). We're now in a position where we have to maintain two versions of the game, one Mac version built on 4.6 and an in-production iOS version on unity 5.

The only reason we are currently not able to move the mac project over to Unity 5 is this bug that makes our mail system, built on GUI.TextArea, completely unusable on OSX.

We're not the only devs with this issue.

I can't resolve this issue by using the new unity ui text classes, as the original GUI code (which our mail system is drawn with) draws on top of everything else.

Since unity GUI has not yet been deprecated, when is this issue going to be looked at?