Fix IME position with fullwidth chars in search

CHANGELOG.md

@@ -43,6 +43,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Pasting into clients only supporting `UTF8_STRING` mime type on Wayland
 - Crash when copying/pasting with neither pointer nor keyboard focus on Wayland
 - Crash due to fd leak on Wayland
+- IME window position with fullwidth characters in the search bar
 
 ## 0.5.0
 

alacritty/src/display.rs

@@ -598,7 +598,7 @@ impl Display {
                 self.draw_search(config, &size_info, message_bar_lines, &search_text);
 
                 // Compute IME position.
-                Point::new(size_info.lines() - 1, Column(search_text.len() - 1))
+                Point::new(size_info.lines() - 1, Column(search_text.chars().count() - 1))
             },
             None => cursor_point,
         };
@@ -640,10 +640,11 @@ impl Display {
 
         // Truncate beginning of the search regex if it exceeds the viewport width.
         let num_cols = size_info.cols().0;
-        let label_len = search_label.len();
-        let regex_len = formatted_regex.len();
+        let label_len = search_label.chars().count();
+        let regex_len = formatted_regex.chars().count();
         let truncate_len = min((regex_len + label_len).saturating_sub(num_cols), regex_len);
-        let truncated_regex = &formatted_regex[truncate_len..];
+        let index = formatted_regex.char_indices().nth(truncate_len).map(|(i, _c)| i).unwrap_or(0);
+        let truncated_regex = &formatted_regex[index..];
 
         // Add search label to the beginning of the search regex.
         let mut bar_text = format!("{}{}", search_label, truncated_regex);