Visually unclear where code cell output ends and following markdown cell starts

Say cell 1 is code: a loop that prints hi
Say cell 2 is markdown saying that same hi
Say you have selected cell 3.
Now the (output of) cell 2 is easily misinterpreted as the output of cell 1

No source file or test is named. Reproduce the two-cell scenario with the third cell selected, then inspect the notebook interface entry points responsible for rendering cell output and markdown. Done means the boundary between code output and the following markdown cell is visually unambiguous.

Written by the indexing model from the issue text.