Determine Buffer::is_dirty based on the rope's fingerprint

crates/text/src/rope.rs

@@ -2,7 +2,7 @@ use crate::PointUtf16;
 
 use super::Point;
 use arrayvec::ArrayString;
-use bromberg_sl2::HashMatrix;
+use bromberg_sl2::{DigestString, HashMatrix};
 use smallvec::SmallVec;
 use std::{cmp, fmt, io, mem, ops::Range, str};
 use sum_tree::{Bias, Dimension, SumTree};
@@ -729,6 +729,12 @@ pub struct TextSummary {
     pub fingerprint: HashMatrix,
 }
 
+impl TextSummary {
+    pub fn hex_fingerprint(&self) -> String {
+        self.fingerprint.to_hex()
+    }
+}
+
 impl<'a> From<&'a str> for TextSummary {
     fn from(text: &'a str) -> Self {
         let mut lines = Point::new(0, 0);