Commit [ecac08] Maximize Restore History

Sync OpenBSD patchset 648:

copy mode uses the real screen as backing and if it is updated while copying,
strange things can happen. So, freeze reading from the pty while in copy mode.

Tiago Cunha Tiago Cunha 2010-02-26

changed server-window.c
changed tmux.h
changed window-copy.c
server-window.c Diff Switch to side-by-side view
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tmux.h Diff Switch to side-by-side view
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window-copy.c Diff Switch to side-by-side view
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