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This adds logic to get the DA1 report from the hosting terminal on startup. We then use the information to figure out if it supports rectangular area operations. If so, we can use DECCRA/DECFRA to implement ScrollConsoleScreenBuffer. This additionally changes `ScrollConsoleScreenBuffer` to always forbid control characters as the fill character, even in conhost (via `VtIo::SanitizeUCS2`). My hope is that this makes the API more consistent and robust as it avoids another source for invisible control characters in the text buffer. Part of #17643 ## Validation Steps Performed * New tests ✅ |
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