Hide view::scroll behind unstable_scroll feature

Cargo.toml

@@ -78,6 +78,7 @@ markdown = ["pulldown-cmark"]
 ncurses-backend = ["ncurses", "maplit", "term_size"]
 pancurses-backend = ["pancurses", "maplit", "term_size"]
 termion-backend = ["termion"]
+unstable_scroll = []
 
 [lib]
 name = "cursive"

src/view/mod.rs

@@ -51,7 +51,11 @@ mod view_trait;
 // Helper bases
 mod boxable;
 mod identifiable;
+#[cfg(feature = "unstable_scroll")]
 pub mod scroll;
+#[cfg(not(feature = "unstable_scroll"))]
+pub(crate) mod scroll;
+
 mod scroll_base;
 mod scrollable;
 

src/view/scroll/mod.rs

@@ -1,5 +1,7 @@
 //! Core mechanisms to implement scrolling.
 //!
+//! *This module is still unstable and may go through breaking changes.*
+//!
 //! This module defines [`ScrollCore`](crate::view::scroll::ScrollCore) and related traits.
 //!
 //! [`ScrollView`](crate::views::ScrollView) may be an easier way to add scrolling to an existing view.