fix: composing indicators not showing (fix #3527)

the fact this even worked in vertical mode was only due to a theming
edge case.
8 jobs for main in 7 minutes and 36 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Lint
passed #32407
mypyc

00:02:04

passed #32405
pylint-latest

00:03:43

passed #32406
pylint-plugins

00:03:38

passed #32404
security-check

00:01:23

 
  Test
passed #32408
pytest-3.7

00:02:21

passed #32409
pytest-latest

00:02:29

 
  Build
passed #32410
www
build-doc

00:01:22

passed #32411
build-ubuntu

00:00:41