unicode: use new decoded_width function

For now, only add it in a single place. There are more instances where
width calculation could be improved, but this one has already been
converted to use the `unicode-width` crate before, so conversion is easy
and a strict improvement.

Closes #12457

Cargo.lock

@@ -296,7 +296,6 @@ dependencies = [
  "rsconf",
  "rust-embed",
  "serial_test",
- "unicode-width",
  "unix_path",
  "xterm-color",
 ]

Cargo.toml

@@ -126,7 +126,6 @@ num-traits.workspace = true
 once_cell.workspace = true
 pcre2.workspace = true
 rand.workspace = true
-unicode-width.workspace = true
 xterm-color.workspace = true
 
 [target.'cfg(not(target_has_atomic = "64"))'.dependencies]

src/pager.rs

@@ -15,7 +15,7 @@
 use crate::screen::{CharOffset, Line, ScreenData, wcswidth_rendered, wcwidth_rendered};
 use crate::termsize::Termsize;
 use fish_wcstringutil::string_fuzzy_match_string;
-use unicode_width::UnicodeWidthStr as _;
+use fish_widestring::decoded_width;
 
 /// Represents rendering from the pager.
 #[derive(Default)]
@@ -1044,13 +1044,11 @@ pub fn set_fully_disclosed(&mut self) {
 
     // Position of the cursor.
     pub fn cursor_position(&self) -> usize {
-        let mut result = sprintf!(
+        let mut result = decoded_width(&sprintf!(
             "%s %s",
             wgettext!(SEARCH_FIELD_PROMPT),
             self.search_field_line.text()
-        )
-        .to_string()
-        .width();
+        ));
         // Clamp it to the right edge.
         if self.available_term_width > 0 && result + 1 > self.available_term_width {
             result = self.available_term_width - 1;