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I20260603-1800

I20260603-1800: Add characterization tests for terminal scrolling behavior
@vogella vogella tagged this 03 Jun 19:35 
Preparation work for https://github.com/eclipse-platform/eclipse.platform/issues/2680
to ensure stability before changing how scroll regions interact with the
scroll-back history.

These lock the current behavior of VT100EmulatorBackend:

- a newline in the full window grows the history (must be preserved),
- a newline at the bottom of a scroll region with a non-top margin scrolls in
  place and discards the top line (must be preserved),
- a reverse line feed at the top of a region scrolls down in place (must be
  preserved),
- a newline at the bottom of a top-anchored region currently discards the top
  line; this documents the status quo that the planned fix will change so the
  line is added to the scroll-back instead.

No production code changes.
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