Just added a 
+1 on this.
Really miss this too.
But must say. I found a workaround that even brings some advantages:
(See also my posting “how to structure your flows”)
For flows that I know I will call from other flows: I create a virtual device pushbutton and use that as a trigger (instead of “when this flow is triggered”)
Virtual device do show flow dependencies…
When you create a new flow that is triggered by another flow, you do not need to go to the the other flow to add the “trigger this flow”
Just stay in your new flow and find that virtual device button…
And you can even trigger that same virtual button at different times…
This is the virtual button showing the flows its triggering:
I trigger the same button at different times
Sleeping in on sundays…
