Iterate over the bytes instead of characters when counting brackets.

src/parser/org_source.rs

@@ -19,8 +19,8 @@ pub struct OrgSource<'s> {
     start_of_line: usize,
     preceding_character: Option<char>,
     line_number: usize,
-    bracket_depth: isize, // []
-    brace_depth: isize, // {}
+    bracket_depth: isize,     // []
+    brace_depth: isize,       // {}
     parenthesis_depth: isize, // ()
 }
 
@@ -148,28 +148,28 @@ where
         let mut bracket_depth = self.bracket_depth;
         let mut brace_depth = self.brace_depth;
         let mut parenthesis_depth = self.parenthesis_depth;
-        for (offset, character) in skipped_text.char_indices() {
-            match character {
-                '\n' => {
+        for (offset, byte) in skipped_text.bytes().enumerate() {
+            match byte {
+                b'\n' => {
                     start_of_line = self.start + offset + 1;
                     line_number += 1;
                 }
-                '[' => {
+                b'[' => {
                     bracket_depth += 1;
                 }
-                ']' => {
+                b']' => {
                     bracket_depth -= 1;
                 }
-                '{' => {
+                b'{' => {
                     brace_depth += 1;
                 }
-                '}' => {
+                b'}' => {
                     brace_depth -= 1;
                 }
-                '(' => {
+                b'(' => {
                     parenthesis_depth += 1;
                 }
-                ')' => {
+                b')' => {
                     parenthesis_depth -= 1;
                 }
                 _ => {}