MessageWindow: Allow only JIDs as argument for get_control()

3 jobs for master in 2 minutes and 50 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #11812
run-appdata

00:00:05

passed #11811
run-tests

00:02:34

 
  Build
passed #11813
run-build

00:00:10