OS: Windows 10 64 bit
GPU: RX 470
Blender 2.79 and older
Short description of error
"Active Object" coloring does not appear on grouped objects, instead "Objects Grouped Active" color which sound logical. However selecting more than one grouped objects makes both of them appear as "Objects Grouped Active" which isn't logical since only one object can be active. Real active object can only be noticed by origin dot that actually displays in "Active Object" color.
I believe is that correct way is for "Active Object" to be dominant for both types, while "Objects Grouped Active" should be changed to "Objects Grouped Selected" which is currently not there, but it partly acts like it.
Exact steps for others to reproduce the error
Selecting multiple grouped objects.