[THIN] minor issue, but annoying

I have noticed that while we do have clipboard mapping turned on, it doesn't
seem to carry over all the time.

If I am copying stuff from outside the session and pasting it within the
session it seems to work fine UNTIL I copy and paste something from Inside
the session to another point inside the same session.  After that anything I
copy from outside teh session and paste into the session seems ignored and
only the last thing copied Inside the session shows up.

Its probably addressed already but I havent found a "search friendly" way to
describe the problem so I can track it down

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