[Qgis-developer] What is it done for : add expression capabilities to the field model

[rldhont]

Hi dev,

I just found a new commit :
ff467dadd53e7162f34a5280f9afcfbad8f83c5b
add expression capabilities to the field model
https://github.com/qgis/QGIS/commit/ff467dadd53e7162f34a5280f9afcfbad8f83c5b

It's promising but there is no issue on hub.qgis.org or on github 
associated and no description about the commit.
This commit has been merged for doing what ?

Regards,