Function decomposition with internal flows

[rcasteran]

Is your test request related to a problem? Please describe. N/A

Describe the test you'd like Add a test to cover the display of function decomposition with and without internal flows like the one below:

 %%jarvis
with test
F is a function
F1 is a function
F2 is a function
F3 is a function
a is a data
F2 produces a
F3 consumes a
F is composed of F1
F1 is composed of F2
F1 is composed of F3

The following decomposition does show the internal flow a:

%%jarvis
with test
show decomposition F

The following decomposition does not show the internal flow a:

%%jarvis
with test
show decomposition F at level 1

The following decomposition does show the internal flow a:

%%jarvis
with test
show decomposition F at level 2

Describe alternatives you've considered None