fix: 🐛 remove double-width characters correctly

Signed-off-by: 刘洋 <liu.yang@xsky.com>
Signed-off-by: bestgopher <84328409@qq.com>

Author: bestgopher

src/term.rs

@@ -336,8 +336,10 @@ impl Term {
             loop {
                 match slf.read_key()? {
                     Key::Backspace => {
-                        if prefix_len < chars.len() && chars.pop().is_some() {
-                            slf.clear_chars(1)?;
+                        if prefix_len < chars.len() {
+                            if let Some(ch) = chars.pop() {
+                                slf.clear_chars(crate::utils::char_width(ch))?;
+                            }
                         }
                         slf.flush()?;
                     }

src/utils.rs

@@ -719,7 +719,7 @@ fn str_width(s: &str) -> usize {
 }
 
 #[cfg(feature = "ansi-parsing")]
-fn char_width(c: char) -> usize {
+pub(crate) fn char_width(c: char) -> usize {
     #[cfg(feature = "unicode-width")]
     {
         use unicode_width::UnicodeWidthChar;
@@ -732,6 +732,11 @@ fn char_width(c: char) -> usize {
     }
 }
 
+#[cfg(not(feature = "ansi-parsing"))]
+pub(crate) fn char_width(_c: char) -> usize {
+    1
+}
+
 /// Truncates a string to a certain number of characters.
 ///
 /// This ensures that escape codes are not screwed up in the process.