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HAH. But then, shouldn't we get rid of the entire cached viewport? We're just kicking the "torn state" can down the road...
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In the past scrolling was entirely implicit in the renderer as it computed the scroll and its invalidation just from the previous and current viewport. Nowadays we also got explicit scrolling,
presumably for ConPTYedit: it was added with v2. Unfortunately (and similar to other parts here), the old code never got removed/unified and so we need to retain the behavior for both.