Guard against old discrete scales with identity palettes #5933
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This PR is an amendement to #5770.
Briefly, we introduced the
palette
argument, but revdep check show that some people contstruct their discrete position scales usingdiscrete_scale(..., palette = identity)
. The identity palette is problematic as it doesn't return the expected values. This PR replaces identity palettes withseq_len
to keep consistent behaviour with older scales.