Nameplates highlight

[Rainrider]

Post 5.1 we get the nameplate "parts" like this

local barFrame, nameFrame = nameplate:GetChildren()
local glowRegion, overlayRegion, highlightRegion, levelTextRegion, bossIconRegion, raidIconRegion, stateIconRegion = barFrame:GetRegions()

Could anyone tell me when highlightRegion is shown? Tried to test this myself and it seems it shows sometimes when one places the mouse over the nameplate, but most of the time this didn't happen.

[Rainrider]

I got some time the play a bit with this. The highlight can never be seen with the default ui, because it is wrongly parented to the bar frame (child frame of the name plate frame), when it should be parented to the name plate frame itself. Here is what I used for testing in case someone wants to see for himself. To trigger the highlight, you must hover a name plate.