Visual indicator between a layer and a group
In the layers panel, a group and a layer look the same in appearance. Thus, when a named group un-grouped accidently, it loses its name. This mostly occurs due to lack of visual dissimilarity between and group and layer thumbnail. May be a small marker in the corner of the thumbnail (indicating whether its a layer or a group) should do the trick.
John Fisher commented
Definitely need the ability to recognize group vs. layer at a glance in the layers panel.