Fix handling of text markup at the start/end of regular link descriptions and radio targets.

src/parser/util.rs

@@ -1,3 +1,5 @@
+use std::fmt::Debug;
+
 use nom::branch::alt;
 use nom::character::complete::anychar;
 use nom::character::complete::line_ending;
@@ -301,3 +303,28 @@ pub(crate) fn get_has_affiliated_keyword<'b, 'g, 'r, 's>(
     }
     None
 }
+
+/// Reset the input OrgSource as if it was starting a fresh document.
+///
+/// This is important for making start-of-document, end-of-document, and other context-dependent tests succeed.
+pub(crate) fn confine_context<'s, O: Debug, I: Fn(OrgSource<'s>) -> Res<OrgSource<'s>, O>>(
+    inner: I,
+) -> impl Fn(OrgSource<'s>) -> Res<OrgSource<'s>, O> {
+    move |input| impl_confine_context(input, &inner)
+}
+
+/// Reset the input OrgSource as if it was starting a fresh document.
+///
+/// This is important for making start-of-document, end-of-document, and other context-dependent tests succeed.
+#[cfg_attr(
+    feature = "tracing",
+    tracing::instrument(ret, level = "debug", skip(inner))
+)]
+fn impl_confine_context<'s, O: Debug, I: Fn(OrgSource<'s>) -> Res<OrgSource<'s>, O>>(
+    input: OrgSource<'s>,
+    inner: I,
+) -> Res<OrgSource<'s>, O> {
+    let raw_str = Into::<&str>::into(input);
+    let back_to_org_source = Into::<OrgSource<'_>>::into(raw_str);
+    inner(back_to_org_source)
+}