Calculate width of Styleds directly

src/frame.rs

@@ -67,6 +67,15 @@ impl Frame {
         self.widthdb.width(s)
     }
 
+    /// Like [`Self::width`] for [`Styled`].
+    pub fn width_styled(&mut self, s: &Styled) -> usize {
+        let mut total: usize = 0;
+        for grapheme in s.graphemes() {
+            total += self.widthdb.grapheme_width(grapheme) as usize;
+        }
+        total
+    }
+
     pub fn tab_width_at_column(&self, col: usize) -> u8 {
         wrap::tab_width_at_column(self.tab_width, col)
     }