fix: Fix panic in progress due to splitting unicode incorrectly

crates/rust-analyzer/src/cli/progress_report.rs

@@ -79,8 +79,8 @@ impl<'a> ProgressReport<'a> {
         // Backtrack to the first differing character
         let mut output = String::new();
         output += &'\x08'.to_string().repeat(self.text.len() - common_prefix_length);
-        // Output new suffix
-        output += &text[common_prefix_length..text.len()];
+        // Output new suffix, using chars() iter to ensure unicode compatibility
+        output.extend(text.chars().skip(common_prefix_length));
 
         // If the new text is shorter than the old one: delete overlapping characters
         if let Some(overlap_count) = self.text.len().checked_sub(text.len()) {