iframe-proxy | Sunbelt Computer Software

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PR1706 follow-ups (#1716)

* fix(plot): avoid leaking plot_backend into the global environment

profile.R is sourced as the user's R_PROFILE_USER, so the top-level
plot_backend assignment created a stray variable in the user's global
environment that persisted after startup (reported by @Fred-Wu).

Wrap the sess::connect() setup in local() so the temporary plot_backend
binding stays scoped, matching the pattern used by the .Rprofile block
above it.

* feat(plot): warn when a requested plot backend is unavailable

When r.plot.backend explicitly selects jgd or httpgd (or the legacy
r.plot.useHttpgd is true) but the package is not installed, register_hooks
silently fell back to the standard viewer. The standard viewer has no
plot-cycling UI, so users saw a degraded experience with no explanation
(several reports on #1706).

Emit a warning from register_hooks naming the requested backend and the
remedy, but only when a specific backend was explicitly requested. The
auto mode (use_jgd && use_httpgd) still degrades silently by design.