Get individual grapheme's width

src/frame.rs

@@ -39,7 +39,19 @@ impl Frame {
         self.set_cursor(None);
     }
 
-    pub fn width(&mut self, s: &str) -> u8 {
+    /// Determine the width of a grapheme.
+    ///
+    /// If the width has not been measured yet, it is estimated using the
+    /// Unicode Standard Annex #11.
+    pub fn grapheme_width(&mut self, grapheme: &str) -> u8 {
+        self.widthdb.grapheme_width(grapheme)
+    }
+
+    /// Determine the width of a string based on its graphemes.
+    ///
+    /// If the width of a grapheme has not been measured yet, it is estimated
+    /// using the Unicode Standard Annex #11.
+    pub fn width(&mut self, s: &str) -> usize {
         self.widthdb.width(s)
     }