Occasionnally missing bits of widgets in the top-right GNOME Shell tray on Jessie

Originally created by @intrigeri on #10576 (Redmine)

Sometimes, I don’t see the date/time nor the ibus menu icon. It seems random and exact symptoms vary. I think that sajolida has seen it too.

In my case (Spice/QXL/QEMU VM), where I can dynamically change the display size & resolution, making the display way bigger fixes the bug, and reverting to the initial display size reverts back to the problematic initial state.

Attachments

• journal
• screenshot.png
• clickable area.png
• new-session.png
• broken-without-qt.png
• fixed-without-qt.png

Related issues

• Related to #10807 (closed)
• Related to #8309 (closed)
• Related to #11045 (closed)
• Has duplicate #10963 (closed)