Add serde feature

src/cursor.rs

@@ -2,14 +2,17 @@ use crate::widget::Viewport;
 use crate::word::{find_word_start_backward, find_word_start_forward};
 #[cfg(feature = "arbitrary")]
 use arbitrary::Arbitrary;
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
 use std::cmp;
 
 /// Specify how to move the cursor.
 ///
 /// This type is marked as `#[non_exhaustive]` since more variations may be supported in the future.
 #[non_exhaustive]
-#[derive(Clone, Copy, Debug)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "arbitrary", derive(Arbitrary))]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum CursorMove {
     /// Move cursor forward by one character. When the cursor is at the end of line, it moves to the head of next line.
     /// ```