Update Cursive::find_id doc comment
Mention SelectView and the need to get the type right.
@@ -470,6 +470,28 @@ impl Cursive {
/// view.set_content("bar");
/// ```
///
+ /// Note that you must specify the exact type for the view you're after; for example, using the
+ /// wrong item type in a `SelectView` will not find anything:
+ ///
+ /// ```rust
+ /// # use cursive::Cursive;
+ /// # use cursive::views::{SelectView};
+ /// # let mut siv = Cursive::dummy();
+ /// use cursive::traits::Identifiable;
+ ///
+ /// let select = SelectView::new().item("zero", 0u32).item("one", 1u32);
+ /// siv.add_layer(select.with_id("select"));
+ ///
+ /// // Specifying a wrong type will not return anything.
+ /// assert!(siv.find_id::<SelectView<String>>("select").is_none());
+ ///
+ /// // Omitting the type will use the default type, in this case `String`.
+ /// assert!(siv.find_id::<SelectView>("select").is_none());
+ ///
+ /// // But with the correct type, it works fine.
+ /// assert!(siv.find_id::<SelectView<u32>>("select").is_some());
+ /// ```
+ ///
/// [`IdView`]: views/struct.IdView.html
/// [`ViewRef`]: views/type.ViewRef.html
pub fn find_id<V>(&mut self, id: &str) -> Option<views::ViewRef<V>>
