Add mergeTextWithHistory function

src/utils/history.rs

@@ -0,0 +1,15 @@
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
+#[cfg(feature = "wasm")]
+use wasm_bindgen::prelude::*;
+
+#[cfg_attr(feature = "wasm", wasm_bindgen)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum History {
+    Unchanged = "Unchanged",
+    AddedFromLeft = "AddedFromLeft",
+    AddedFromRight = "AddedFromRight",
+    RemovedFromLeft = "RemovedFromLeft",
+    RemovedFromRight = "RemovedFromRight",
+}