Fixed in version 4.12.1, and therefore not affecting 18.04 anymore.
https://git.xfce.org/xfce/xfce4-panel/tree/NEWS?h=xfce-4.12
** Changed in: xfce4-panel (Ubuntu)
Status: Confirmed => Fix Released
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Bugs, which is
** Bug watch added: Xfce Bugzilla #11540
https://bugzilla.xfce.org/show_bug.cgi?id=11540
** Also affects: xfce4-panel via
https://bugzilla.xfce.org/show_bug.cgi?id=11540
Importance: Unknown
Status: Unknown
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** Changed in: xfce4-panel (Ubuntu)
Status: New = Incomplete
** Changed in: xfce4-panel (Ubuntu)
Status: Incomplete = New
** Changed in: xfce4-panel (Ubuntu)
Status: New = Confirmed
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Bugs, which is
