Florence systray icon sometimes does not show up

Seen it several times in Jenkins: sometimes tests fails at the “desktop is ready” step because the Florence systray does not even shows up.

First time this error happens in Jenkins is in 2016 August 25, so it’s unlikely that it is related to the introduction of #8312 (closed), which was merged a few days after that (on the 29th).

It seems to happen quite often in Jenkins.

See https://jenkins.tails.boum.org/job/test_Tails_ISO_devel/499/

Might be that the icon is invisible, but the Florence keyboard is still accessible by clicking on its systray zone, as mentioned in #11479 (closed).

Related issues

• Related to #8312 (closed)
• Related to #11479 (closed)

Original created by @bertagaz on 11872 (Redmine)