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As it turns out, we can't portably load the initial terminal contents (there are some hacks of various EXTREME nature, but none of them are worth it for the rather limited benefit). The O(1)-time damage inference requires knowledge of what was previously present to inibit unnecessary draws. We would then need some special cell value indicating "not yet written to" to distinguish a purposeful null cell from an initial cell. Again, we could do this, but for what value? Finally, the idea of clearing new area on SIGWINCH was always flawed, as we can't do that from a signal handler. With the advent of direct mode #77, the reason for this largely goes away in any case.