Outliner objects with only one child should be collapsed to a single, unexpandable row when possible.

Sometimes the outliner has objects who have only a single child, like these do:

This wastes space. Instead, objects like this should have their child displayed in the same row, like in this mockup:

This way, both the name of the object and its mesh data are visible and editable, but in half the vertical space. Further, since the rows can't be expanded, these space gains will be realized even when users use the + key to expand other rows. It also becomes easier to compare object names to mesh data names, which is useful if the two are supposed to be the same.