implement Clone for TextArea and its dependencies

src/history.rs

@@ -54,6 +54,7 @@ impl EditKind {
     }
 }
 
+#[derive(Clone)]
 pub struct Edit {
     kind: EditKind,
     cursor_before: (usize, usize),
@@ -92,6 +93,7 @@ impl Edit {
     }
 }
 
+#[derive(Clone)]
 pub struct History {
     index: usize,
     max_items: usize,

src/search.rs

@@ -1,6 +1,7 @@
 use regex::Regex;
 use tui::style::{Color, Style};
 
+#[derive(Clone)]
 pub struct Search {
     pub pat: Option<Regex>,
     pub style: Style,

src/textarea.rs

@@ -31,6 +31,7 @@ use tui::widgets::{Block, Widget};
 /// // Get lines as String.
 /// println!("Lines: {:?}", textarea.lines());
 /// ```
+#[derive(Clone)]
 pub struct TextArea<'a> {
     lines: Vec<String>,
     block: Option<Block<'a>>,

src/widget.rs

@@ -17,6 +17,13 @@ use tui::widgets::{Block, Paragraph, Widget};
 #[derive(Default)]
 pub struct ScrollTop(AtomicU32);
 
+impl Clone for ScrollTop {
+    fn clone(&self) -> Self {
+        let u = self.0.load(Ordering::Relaxed);
+        ScrollTop(AtomicU32::new(u))
+    }
+}
+
 impl ScrollTop {
     fn load(&self) -> (u16, u16) {
         let u = self.0.load(Ordering::Relaxed);