Take Into<Pixels> in TextEditor::width

Since a `Shrink` width would not make sense.

widget/src/text_editor.rs

@@ -110,8 +110,8 @@ where
     }
 
     /// Sets the width of the [`TextEditor`].
-    pub fn width(mut self, width: impl Into<Length>) -> Self {
-        self.width = width.into();
+    pub fn width(mut self, width: impl Into<Pixels>) -> Self {
+        self.width = Length::from(width.into());
         self
     }