Show required features for documentation on docs.rs

rust-lang/rust#43781
Locally: RUSTDOCFLAGS='--cfg docsrs' cargo +nightly doc --all-features

Author: RickyDaMa

fontheight-core/Cargo.toml

@@ -24,3 +24,7 @@ rayon = { version = "1.10", optional = true }
 rustybuzz = "0.20.1"
 skrifa = "0.26.5"
 thiserror = "2"
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]

fontheight-core/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+
 use std::collections::HashMap;
 
 use exemplars::ExemplarCollector;