Allow text markup at the start of a radio target.

src/parser/text_markup.rs

@@ -283,7 +283,7 @@ fn _text_markup_string<'b, 'g, 'r, 's, 'c>(
 
 #[cfg_attr(feature = "tracing", tracing::instrument(ret, level = "debug"))]
 fn pre<'b, 'g, 'r, 's>(
-    _context: RefContext<'b, 'g, 'r, 's>,
+    context: RefContext<'b, 'g, 'r, 's>,
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, ()> {
     if start_of_line(input).is_ok() {
@@ -292,6 +292,16 @@ fn pre<'b, 'g, 'r, 's>(
     if preceded_by_whitespace(true)(input).is_ok() {
         return Ok((input, ()));
     }
+    let radio_target_start = context
+        .iter()
+        .find_map(|c| match c {
+            ContextElement::StartRadioTarget(text) => Some(text),
+            _ => None,
+        })
+        .map(|text| text.get_byte_offset());
+    if Some(input.get_byte_offset()) == radio_target_start {
+        return Ok((input, ()));
+    }
     let preceding_character = input.get_preceding_character();
     match preceding_character {
         // If None, we are at the start of the file which is technically the beginning of a line.