fix and coverage for layout modifiers

src/lib.rs

@@ -1949,7 +1949,7 @@ macro_rules! eval_xy (
         let mut chars = text.as_ref().chars();
         while let Some(c) = chars.next() {
             width += c.width().unwrap_or(0) as u16;
-            if width > max {
+            if width >= max {
                 break
             }
         }