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Check if buffer-invisibility-spec is equal t before checking member
According to the documentation buffer-invisibility-spec is equal to t by default and can also be a list.
This patch handle the case when buffer-invisibility-spec is not a list.
gentle ping
thanks for the PR. I came to a similar conclusion in #8
Oops, I just posted an identical PR. Is this thing alive?
No, doesn't seem to be.