Dear Maintainer,

   * What led up to the situation?

I removed a launcher. I tried this 3 times, with 3 different
launchers, and had the same result.

   * What exactly did you do (or not do) that was effective (or ineffective)?

I right-clicked on a launcher in a panel, and clicked remove.

   * What was the outcome of this action?

All the panels disappear. After logging out and logging in again, I
can see that the launcher has been removed.

   * What outcome did you expect instead?

The launcher should be removed without all the panels disappearing.

I took a log with PANEL_DEBUG=1, so I will attach that to this report.