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lib-vt tracks a hyperlink per cell and slosh dropped every one of them: the
client's terminal can only offer a link it was sent, so `ls --hyperlink`,
gcc diagnostics and friends silently lost theirs inside the session.
The link rides beside the cell -- cell_t is the shader ABI and a link is
not a colour -- as a plane of ids into an interned URI table, append-only
so an id in prev_link still means the same URI next frame (which is what
lets the diff compare ids instead of strings), and capped so a hostile pane
cannot grow it forever. URIs with control bytes are refused outright: they
are emitted verbatim inside an OSC, and a control byte in one is a way to
write escape sequences into the client's terminal. The diff wraps emitted
runs in OSC 8, closes what it opens before the frame ends, and treats a
link-only change as a change. Chrome painted over a link takes the link
with it, so a frame, modal or float across a URL is never clickable with
the pane's link; links survive scrollback with the text that carries them.
Plain-text URLs stay the outer terminal's own matcher, with the catch
documented in panes.md: under mouse capture Ghostty only offers links with
shift added to the gesture (shift+cmd hover/click), shift being its
capture escape. Wrapped URLs can never be regex-matched through a
multiplexer -- rows repaint as hard lines -- which is exactly what OSC 8
links, passing through whole, are for.
`snapshot format:"bytes"` returns the emitter's own output for a frame (a
second call is the delta): the model and the bytes are two different
things, and this codebase already paid once for asserting on one while the
other was wrong.
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