Docs: wrap, update.

Author: bjones1

docs/changelog.md

@@ -22,6 +22,7 @@ Changelog
 *   [Github master](https://github.com/bjones1/CodeChat_Editor):
     *   Fix indexing in diffs for characters that use more than one UTF-16 code
         unit, such as 😄,👉🏿,👨‍👦, and 🇺🇳.
+    *   Fix data corruption with adjacent doc blocks.
 *   v0.1.23, 2025-Jul-24
     *   Correct diff errors in IDE with CRLF line endings.
     *   Upgrade to newest release of MathJax, TinyMCE.
@@ -124,4 +125,5 @@ Changelog
     *   Cross-platform fixes.
 *   v0.1.0, 2024-Oct-16:
     *   Initial release, with binaries for Windows only. Built with
-        manually-patched CodeMirror per \[this
+        manually-patched CodeMirror per [this
+        issue](https://github.com/bjones1/CodeChat_Editor/issues/27).

server/src/processing.rs

@@ -413,7 +413,9 @@ fn byte_index_of(s: &str, utf_16_index: usize) -> usize {
 /// Translate from CodeMirror to CodeDocBlocks.
 fn code_mirror_to_code_doc_blocks(code_mirror: &CodeMirror) -> Vec<CodeDocBlock> {
     let doc_blocks = &code_mirror.doc_blocks;
-    // Translate between UTF-16 code units (the `from` and `to` provided by CodeMirror) and byte indexes (which Rust uses). Keep track of the current byte index/UTF-16 index; we always move forward from that location.
+    // Translate between UTF-16 code units (the `from` and `to` provided by
+    // CodeMirror) and byte indexes (which Rust uses). Keep track of the current
+    // byte index/UTF-16 index; we always move forward from that location.
     let mut byte_index: usize = 0;
     let mut utf16_index: usize = 0;
     let mut code_doc_block_arr: Vec<CodeDocBlock> = Vec::new();
@@ -1060,15 +1062,17 @@ pub fn diff_code_mirror_doc_blocks(
         &mut change_specs,
     );
 
-    // If two doc blocks immediately follow each other: `# foo\n # bar\n`, for example,
-    // and a line is inserted before both, then a problem occurs when applying the change:
-    // applying the change to the first block sets its `from` value to the `from` value
-    // for the second block. This violates a doc blocks invariant -- each doc block
-    // must have a unique `from` value; therefore, these two doc blocks can no longer be
-    // distinguished, making it impossible to apply the change to the second doc block.
-    // More generally, this can occur with an insert before a series of blocks which
-    // immediately follow each other. Therefore, look for sequences of updates where `from_new` of a previous entry == `from` of the current
-    // entry and swap these sequences.
+    // If two doc blocks immediately follow each other: `# foo\n # bar\n`, for
+    // example, and a line is inserted before both, then a problem occurs when
+    // applying the change: applying the change to the first block sets its
+    // `from` value to the `from` value for the second block. This violates a
+    // doc blocks invariant -- each doc block must have a unique `from` value;
+    // therefore, these two doc blocks can no longer be distinguished, making it
+    // impossible to apply the change to the second doc block. More generally,
+    // this can occur with an insert before a series of blocks which immediately
+    // follow each other. Therefore, look for sequences of updates where
+    // `from_new` of a previous entry == `from` of the current entry and swap
+    // these sequences.
     let mut immediate_sequence_start_index: Option<usize> = None;
     for index in 1..change_specs.len() {
         if let CodeMirrorDocBlockTransaction::Update(prev_update) = &change_specs[index - 1]

server/src/processing/tests.rs

@@ -1122,7 +1122,8 @@ fn test_diff_2() {
     assert_eq!(
         ret,
         vec![
-            // Order is important -- first, 12->13, then 11->12, 10->11 (reversed order).
+            // Order is important -- first, 12->13, then 11->12, 10->11
+            // (reversed order).
             CodeMirrorDocBlockTransaction::Update(CodeMirrorDocBlockUpdate {
                 from: 12,
                 from_new: 13,
@@ -1165,7 +1166,8 @@ fn test_diff_2() {
     assert_eq!(
         ret,
         vec![
-            // Order is important -- 11->12, then 10->11 (reversed), then 13->14.
+            // Order is important -- 11->12, then 10->11 (reversed), then
+            // 13->14.
             CodeMirrorDocBlockTransaction::Update(CodeMirrorDocBlockUpdate {
                 from: 11,
                 from_new: 12,