Make EasyMark numbered lists allow more than 2 digits (#1826)

Co-authored-by: Ygor Souza <ygor.souza@protonmail.com>

egui_demo_lib/src/easy_mark/easy_mark_parser.rs

@@ -101,27 +101,13 @@ impl<'a> Parser<'a> {
 
     /// `1. `, `42. ` etc.
     fn numbered_list(&mut self) -> Option<Item<'a>> {
-        let bytes = self.s.as_bytes();
-        // 1. numbered bullet
-        if bytes.len() >= 3 && bytes[0].is_ascii_digit() && bytes[1] == b'.' && bytes[2] == b' ' {
-            let number = &self.s[0..1];
-            self.s = &self.s[3..];
+        let n_digits = self.s.chars().take_while(|c| c.is_ascii_digit()).count();
+        if n_digits > 0 && self.s.chars().skip(n_digits).take(2).eq(". ".chars()) {
+            let number = &self.s[..n_digits];
+            self.s = &self.s[(n_digits + 2)..];
             self.start_of_line = false;
             return Some(Item::NumberedPoint(number));
         }
-        // 42. double-digit numbered bullet
-        if bytes.len() >= 4
-            && bytes[0].is_ascii_digit()
-            && bytes[1].is_ascii_digit()
-            && bytes[2] == b'.'
-            && bytes[3] == b' '
-        {
-            let number = &self.s[0..2];
-            self.s = &self.s[4..];
-            self.start_of_line = false;
-            return Some(Item::NumberedPoint(number));
-        }
-        // There is no triple-digit numbered bullet. Please don't make numbered lists that long.
         None
     }