Pin the baseline: feed OSC 8 hyperlinks, strikethrough, curly underline,
underline color, and double underline through Proxy, force a render,
and capture what the proxy emits to its stdout side. Each test asserts
the styling survives the round-trip.
All five fail on the current vt100 0.16 backend because its cell model
only stores fg/bg color, bold, dim, italic, underline, inverse — every
other attribute is dropped at render time. Tests are #[ignore]-gated so
CI stays green; run with --ignored to see the baseline failures. Once
the emulator is swapped to termwiz, remove the gates.
A truecolor-foreground sanity test runs by default and confirms the
parts of the SGR space vt100 does support are still working.
Adds Proxy::force_render as a #[cfg(test)] wrapper around the private
render_vt_screen method.
adam
1be6e4954e