Here is reported: https://github.com/passingthru67/workspaces-to-
dock/issues/134
** Bug watch added: github.com/passingthru67/workspaces-to-dock/issues #134
https://github.com/passingthru67/workspaces-to-dock/issues/134
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In my case the bug was on gnome-shell extension "workspaces-to-
dock"(https://github.com/passingthru67/workspaces-to-dock). I found this
log entry:
Apr 24 10:33:35 hostname gnome-shell[2736]: JS ERROR: TypeError:
this._porthole is
undefined#012myThumbnailsBox<._getPreferredWidth@/home/username/.lo