Fix panic when comparing ropes with chunks that do not align at char bounds

src/slice.rs

@@ -1776,35 +1776,35 @@ impl<'a, 'b> std::cmp::PartialEq<RopeSlice<'b>> for RopeSlice<'a> {
 
         let mut chunk_itr_1 = self.chunks();
         let mut chunk_itr_2 = other.chunks();
-        let mut chunk1 = chunk_itr_1.next().unwrap_or("");
-        let mut chunk2 = chunk_itr_2.next().unwrap_or("");
+        let mut chunk1 = chunk_itr_1.next().unwrap_or("").as_bytes();
+        let mut chunk2 = chunk_itr_2.next().unwrap_or("").as_bytes();
 
         loop {
             if chunk1.len() > chunk2.len() {
                 if &chunk1[..chunk2.len()] != chunk2 {
                     return false;
                 } else {
                     chunk1 = &chunk1[chunk2.len()..];
-                    chunk2 = "";
+                    chunk2 = &[];
                 }
             } else if &chunk2[..chunk1.len()] != chunk1 {
                 return false;
             } else {
                 chunk2 = &chunk2[chunk1.len()..];
-                chunk1 = "";
+                chunk1 = &[];
             }
 
             if chunk1.is_empty() {
                 if let Some(chunk) = chunk_itr_1.next() {
-                    chunk1 = chunk;
+                    chunk1 = chunk.as_bytes();
                 } else {
                     break;
                 }
             }
 
             if chunk2.is_empty() {
                 if let Some(chunk) = chunk_itr_2.next() {
-                    chunk2 = chunk;
+                    chunk2 = chunk.as_bytes();
                 } else {
                     break;
                 }
@@ -1823,9 +1823,11 @@ impl<'a, 'b> std::cmp::PartialEq<&'b str> for RopeSlice<'a> {
                 if self.len_bytes() != other.len() {
                     return false;
                 }
+                let other = other.as_bytes();
 
                 let mut idx = 0;
                 for chunk in self.chunks() {
+                    let chunk = chunk.as_bytes();
                     if chunk != &other[idx..(idx + chunk.len())] {
                         return false;
                     }

tests/non_ascii.txt

@@ -0,0 +1,77 @@
+_____________
+
+______________ㅇ_________ㅇㅇㅇ____ㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇㅇ__________
+________________
+_____________________________________________
+____________________________________________
+_______________
+_____________________________________
+____________________________________________________________________
+______________________
+________________________
+_________________________________________________
+______________________________________________________________
+____________________
+______________________________________________
+_________________
+________________
+
+__________________________________________________________
+____________________________________________________
+_______________
+
+________________________________________________
+______________________
+________________________
+________________________________________________________________________
+______________________________
+____________________
+__________________________________________
+__________________
+____________________________________________
+________________
+
+__________________
+_____________________
+_____________________________________________________
+____________________________________________
+_________________
+___________________________________________
+__________________________________________
+___________________________________________________
+___________________________________________________________________
+_______________________
+_______________
+_____________
+
+______________ㅇㅇㅇㅇㅇㅇ____ㅇ_ㅇㅇㅇ____
+______________ㅇㅇㅇㅇ_____________ㅇㅇㅇㅇㅇㅇㅇㅇ____
+____________________________________
+________________________________________________________________________________
+______________________________________
+______________
+
+______________ㅇㅇㅇㅇ_______ㅇㅇㅇㅇㅇㅇ_______ㅇㅇ_____________ㅇㅇㅇㅇㅇ____
+________________________________
+__________________________________________________________________
+_________________________
+______________
+
+__________________________________________________________________
+_______________________________________________
+
+______________________________________
+________________________________________________
+
+_______________________________________________
+__________________________________________________________________
+___________
+_________
+_______________________
+________________________________________________
+_______
+______
+
+________________________________
+_______________________________________
+______

tests/non_ascii_comparison.rs

@@ -0,0 +1,38 @@
+extern crate ropey;
+
+use ropey::Rope;
+
+const TEXT1: &str = include_str!("non_ascii.txt");
+
+#[test]
+#[allow(clippy::cmp_owned)]
+#[cfg_attr(miri, ignore)]
+fn non_ascii_eq() {
+    // Build rope from file contents
+    let rope1 = Rope::from_str(TEXT1);
+
+    let mut rope2 = Rope::from_str(TEXT1);
+    rope2.remove(1467..1827);
+    for line1 in rope1.lines() {
+        for line2 in rope2.lines() {
+            println!("lines1: {line1} line2: {line2}");
+            println!("{}", line1.to_string() == line2);
+            println!("{}", line1 == line2);
+        }
+    }
+}
+
+#[test]
+fn non_ascii_ord() {
+    // Build rope from file contents
+    let rope1 = Rope::from_str(TEXT1);
+
+    let mut rope2 = Rope::from_str(TEXT1);
+    rope2.remove(1467..1827);
+    for line1 in rope1.lines() {
+        for line2 in rope2.lines() {
+            println!("lines1: {line1} line2: {line2}");
+            println!("{:?}", line2.partial_cmp(&line1));
+        }
+    }
+}