fix: text input attempting to subtract with overflow

src/widget/text_input/input.rs

@@ -729,6 +729,7 @@ where
             }
         }
 
+        if tree.children.len() > 0 {
             let index = tree.children.len() - 1;
             if let (Some(trailing_icon), Some(tree)) =
                 (self.trailing_icon.as_mut(), tree.children.get_mut(index))
@@ -755,6 +756,7 @@ where
                     }
                 }
             }
+        }
 
         update(
             event,