Files
llmx/codex-rs/tui/src/markdown_stream.rs
Jeremy Rose 488a40211a fix (most) doubled lines and hanging list markers (#2789)
This was mostly written by codex under heavy guidance via test cases
drawn from logged session data and fuzzing. It also uncovered some bugs
in tui_markdown, which will in some cases split a list marker from the
list item content. We're not addressing those bugs for now.
2025-08-27 13:55:59 -07:00

851 lines
29 KiB
Rust

use std::collections::VecDeque;
use codex_core::config::Config;
use ratatui::text::Line;
use crate::markdown;
use crate::render::markdown_utils::is_inside_unclosed_fence;
use crate::render::markdown_utils::strip_empty_fenced_code_blocks;
/// Newline-gated accumulator that renders markdown and commits only fully
/// completed logical lines.
pub(crate) struct MarkdownStreamCollector {
buffer: String,
committed_line_count: usize,
}
impl MarkdownStreamCollector {
pub fn new() -> Self {
Self {
buffer: String::new(),
committed_line_count: 0,
}
}
/// Returns the number of logical lines that have already been committed
/// (i.e., previously returned from `commit_complete_lines`).
pub fn committed_count(&self) -> usize {
self.committed_line_count
}
pub fn clear(&mut self) {
self.buffer.clear();
self.committed_line_count = 0;
}
/// Replace the buffered content and mark that the first `committed_count`
/// logical lines are already committed.
pub fn replace_with_and_mark_committed(&mut self, s: &str, committed_count: usize) {
self.buffer.clear();
self.buffer.push_str(s);
self.committed_line_count = committed_count;
}
pub fn push_delta(&mut self, delta: &str) {
self.buffer.push_str(delta);
}
/// Render the full buffer and return only the newly completed logical lines
/// since the last commit. When the buffer does not end with a newline, the
/// final rendered line is considered incomplete and is not emitted.
pub fn commit_complete_lines(&mut self, config: &Config) -> Vec<Line<'static>> {
// In non-test builds, unwrap an outer ```markdown fence during commit as well,
// so fence markers never appear in streamed history.
let source = unwrap_markdown_language_fence_if_enabled(self.buffer.clone());
let source = strip_empty_fenced_code_blocks(&source);
let mut rendered: Vec<Line<'static>> = Vec::new();
markdown::append_markdown(&source, &mut rendered, config);
let mut complete_line_count = rendered.len();
if complete_line_count > 0
&& crate::render::line_utils::is_blank_line_spaces_only(
&rendered[complete_line_count - 1],
)
{
complete_line_count -= 1;
}
// Heuristic: if the buffer ends with a double newline and the last non-blank
// rendered line looks like a list bullet with inline content (e.g., "- item"),
// defer committing that line. Subsequent context (e.g., another list item)
// can cause the renderer to split the bullet marker and text into separate
// logical lines ("- " then "item"), which would otherwise duplicate content.
if self.buffer.ends_with("\n\n") && complete_line_count > 0 {
let last = &rendered[complete_line_count - 1];
let mut text = String::new();
for s in &last.spans {
text.push_str(&s.content);
}
if text.starts_with("- ") && text.trim() != "-" {
complete_line_count = complete_line_count.saturating_sub(1);
}
}
if !self.buffer.ends_with('\n') {
complete_line_count = complete_line_count.saturating_sub(1);
// If we're inside an unclosed fenced code block, also drop the
// last rendered line to avoid committing a partial code line.
if is_inside_unclosed_fence(&source) {
complete_line_count = complete_line_count.saturating_sub(1);
}
// If the next (incomplete) line appears to begin a list item,
// also defer the previous completed line because the renderer may
// retroactively treat it as part of the list (e.g., ordered list item 1).
if let Some(last_nl) = source.rfind('\n') {
let tail = &source[last_nl + 1..];
if starts_with_list_marker(tail) {
complete_line_count = complete_line_count.saturating_sub(1);
}
}
}
// Conservatively withhold trailing list-like lines (unordered or ordered)
// because streaming mid-item can cause the renderer to later split or
// restructure them (e.g., duplicating content or separating the marker).
// Only defers lines at the end of the out slice so previously committed
// lines remain stable.
if complete_line_count > self.committed_line_count {
let mut safe_count = complete_line_count;
while safe_count > self.committed_line_count {
let l = &rendered[safe_count - 1];
let mut text = String::new();
for s in &l.spans {
text.push_str(&s.content);
}
let listish = is_potentially_volatile_list_line(&text);
if listish {
safe_count -= 1;
continue;
}
break;
}
complete_line_count = safe_count;
}
if self.committed_line_count >= complete_line_count {
return Vec::new();
}
let out_slice = &rendered[self.committed_line_count..complete_line_count];
// Strong correctness: while a fenced code block is open (no closing fence yet),
// do not emit any new lines from inside it. Wait until the fence closes to emit
// the entire block together. This avoids stray backticks and misformatted content.
if is_inside_unclosed_fence(&source) {
return Vec::new();
}
// Additional conservative hold-back: if exactly one short, plain word
// line would be emitted, defer it. This avoids committing a lone word
// that might become the first ordered-list item once the next delta
// arrives (e.g., next line starts with "2 " or "2. ").
if out_slice.len() == 1 {
let mut s = String::new();
for sp in &out_slice[0].spans {
s.push_str(&sp.content);
}
if is_short_plain_word(&s) {
return Vec::new();
}
}
let out = out_slice.to_vec();
self.committed_line_count = complete_line_count;
out
}
/// Finalize the stream: emit all remaining lines beyond the last commit.
/// If the buffer does not end with a newline, a temporary one is appended
/// for rendering. Optionally unwraps ```markdown language fences in
/// non-test builds.
pub fn finalize_and_drain(&mut self, config: &Config) -> Vec<Line<'static>> {
let mut source: String = self.buffer.clone();
if !source.ends_with('\n') {
source.push('\n');
}
let source = unwrap_markdown_language_fence_if_enabled(source);
let source = strip_empty_fenced_code_blocks(&source);
let mut rendered: Vec<Line<'static>> = Vec::new();
markdown::append_markdown(&source, &mut rendered, config);
let out = if self.committed_line_count >= rendered.len() {
Vec::new()
} else {
rendered[self.committed_line_count..].to_vec()
};
// Reset collector state for next stream.
self.clear();
out
}
}
#[inline]
fn is_potentially_volatile_list_line(text: &str) -> bool {
let t = text.trim_end();
if t == "-" || t == "*" || t == "- " || t == "* " {
return true;
}
if t.starts_with("- ") || t.starts_with("* ") {
return true;
}
// ordered list like "1. " or "23. "
let mut it = t.chars().peekable();
let mut saw_digit = false;
while let Some(&ch) = it.peek() {
if ch.is_ascii_digit() {
saw_digit = true;
it.next();
continue;
}
break;
}
if saw_digit && it.peek() == Some(&'.') {
// consume '.'
it.next();
if it.peek() == Some(&' ') {
return true;
}
}
false
}
#[inline]
fn starts_with_list_marker(text: &str) -> bool {
let t = text.trim_start();
if t.starts_with("- ") || t.starts_with("* ") || t.starts_with("-\t") || t.starts_with("*\t") {
return true;
}
// ordered list marker like "1 ", "1. ", "23 ", "23. "
let mut it = t.chars().peekable();
let mut saw_digit = false;
while let Some(&ch) = it.peek() {
if ch.is_ascii_digit() {
saw_digit = true;
it.next();
} else {
break;
}
}
if !saw_digit {
return false;
}
match it.peek() {
Some('.') => {
it.next();
matches!(it.peek(), Some(' '))
}
Some(' ') => true,
_ => false,
}
}
#[inline]
fn is_short_plain_word(s: &str) -> bool {
let t = s.trim();
if t.is_empty() || t.len() > 5 {
return false;
}
t.chars().all(|c| c.is_alphanumeric())
}
/// fence helpers are provided by `crate::render::markdown_utils`
#[cfg(test)]
fn unwrap_markdown_language_fence_if_enabled(s: String) -> String {
// In tests, keep content exactly as provided to simplify assertions.
s
}
#[cfg(not(test))]
fn unwrap_markdown_language_fence_if_enabled(s: String) -> String {
// Best-effort unwrap of a single outer fenced markdown block.
// Recognizes common forms like ```markdown, ```md (any case), optional
// surrounding whitespace, and flexible trailing newlines/CRLF.
// If the block is not recognized, return the input unchanged.
let lines = s.lines().collect::<Vec<_>>();
if lines.len() < 2 {
return s;
}
// Identify opening fence and language.
let open = lines.first().map(|l| l.trim_start()).unwrap_or("");
if !open.starts_with("```") {
return s;
}
let lang = open.trim_start_matches("```").trim();
let is_markdown_lang = lang.eq_ignore_ascii_case("markdown") || lang.eq_ignore_ascii_case("md");
if !is_markdown_lang {
return s;
}
// Find the last non-empty line and ensure it is a closing fence.
let mut last_idx = lines.len() - 1;
while last_idx > 0 && lines[last_idx].trim().is_empty() {
last_idx -= 1;
}
if lines[last_idx].trim() != "```" {
return s;
}
// Reconstruct the inner content between the fences.
let mut out = String::new();
for l in lines.iter().take(last_idx).skip(1) {
out.push_str(l);
out.push('\n');
}
out
}
pub(crate) struct StepResult {
pub history: Vec<Line<'static>>, // lines to insert into history this step
}
/// Streams already-rendered rows into history while computing the newest K
/// rows to show in a live overlay.
pub(crate) struct AnimatedLineStreamer {
queue: VecDeque<Line<'static>>,
}
impl AnimatedLineStreamer {
pub fn new() -> Self {
Self {
queue: VecDeque::new(),
}
}
pub fn clear(&mut self) {
self.queue.clear();
}
pub fn enqueue(&mut self, lines: Vec<Line<'static>>) {
for l in lines {
self.queue.push_back(l);
}
}
pub fn step(&mut self) -> StepResult {
let mut history = Vec::new();
// Move exactly one per tick to animate gradual insertion.
let burst = if self.queue.is_empty() { 0 } else { 1 };
for _ in 0..burst {
if let Some(l) = self.queue.pop_front() {
history.push(l);
}
}
StepResult { history }
}
pub fn drain_all(&mut self) -> StepResult {
let mut history = Vec::new();
while let Some(l) = self.queue.pop_front() {
history.push(l);
}
StepResult { history }
}
pub fn is_idle(&self) -> bool {
self.queue.is_empty()
}
}
#[cfg(test)]
pub(crate) fn simulate_stream_markdown_for_tests(
deltas: &[&str],
finalize: bool,
config: &Config,
) -> Vec<Line<'static>> {
let mut collector = MarkdownStreamCollector::new();
let mut out = Vec::new();
for d in deltas {
collector.push_delta(d);
if d.contains('\n') {
out.extend(collector.commit_complete_lines(config));
}
}
if finalize {
out.extend(collector.finalize_and_drain(config));
}
out
}
#[cfg(test)]
mod tests {
use super::*;
use codex_core::config::Config;
use codex_core::config::ConfigOverrides;
fn test_config() -> Config {
let overrides = ConfigOverrides {
cwd: std::env::current_dir().ok(),
..Default::default()
};
match Config::load_with_cli_overrides(vec![], overrides) {
Ok(c) => c,
Err(e) => panic!("load test config: {e}"),
}
}
#[test]
fn no_commit_until_newline() {
let cfg = test_config();
let mut c = super::MarkdownStreamCollector::new();
c.push_delta("Hello, world");
let out = c.commit_complete_lines(&cfg);
assert!(out.is_empty(), "should not commit without newline");
c.push_delta("!\n");
let out2 = c.commit_complete_lines(&cfg);
assert_eq!(out2.len(), 1, "one completed line after newline");
}
#[test]
fn finalize_commits_partial_line() {
let cfg = test_config();
let mut c = super::MarkdownStreamCollector::new();
c.push_delta("Line without newline");
let out = c.finalize_and_drain(&cfg);
assert_eq!(out.len(), 1);
}
#[test]
fn heading_starts_on_new_line_when_following_paragraph() {
let cfg = test_config();
// Stream a paragraph line, then a heading on the next line.
// Expect two distinct rendered lines: "Hello." and "Heading".
let mut c = super::MarkdownStreamCollector::new();
c.push_delta("Hello.\n");
let out1 = c.commit_complete_lines(&cfg);
let s1: Vec<String> = out1
.iter()
.map(|l| {
l.spans
.iter()
.map(|s| s.content.clone())
.collect::<Vec<_>>()
.join("")
})
.collect();
assert_eq!(
out1.len(),
1,
"first commit should contain only the paragraph line, got {}: {:?}",
out1.len(),
s1
);
c.push_delta("## Heading\n");
let out2 = c.commit_complete_lines(&cfg);
let s2: Vec<String> = out2
.iter()
.map(|l| {
l.spans
.iter()
.map(|s| s.content.clone())
.collect::<Vec<_>>()
.join("")
})
.collect();
assert_eq!(
s2,
vec!["", "## Heading"],
"expected a blank separator then the heading line"
);
let line_to_string = |l: &ratatui::text::Line<'_>| -> String {
l.spans
.iter()
.map(|s| s.content.clone())
.collect::<Vec<_>>()
.join("")
};
assert_eq!(line_to_string(&out1[0]), "Hello.");
assert_eq!(line_to_string(&out2[1]), "## Heading");
}
#[test]
fn heading_not_inlined_when_split_across_chunks() {
let cfg = test_config();
// Paragraph without trailing newline, then a chunk that starts with the newline
// and the heading text, then a final newline. The collector should first commit
// only the paragraph line, and later commit the heading as its own line.
let mut c = super::MarkdownStreamCollector::new();
c.push_delta("Sounds good!");
// No commit yet
assert!(c.commit_complete_lines(&cfg).is_empty());
// Introduce the newline that completes the paragraph and the start of the heading.
c.push_delta("\n## Adding Bird subcommand");
let out1 = c.commit_complete_lines(&cfg);
let s1: Vec<String> = out1
.iter()
.map(|l| {
l.spans
.iter()
.map(|s| s.content.clone())
.collect::<Vec<_>>()
.join("")
})
.collect();
assert_eq!(
s1,
vec!["Sounds good!", ""],
"expected paragraph followed by blank separator before heading chunk"
);
// Now finish the heading line with the trailing newline.
c.push_delta("\n");
let out2 = c.commit_complete_lines(&cfg);
let s2: Vec<String> = out2
.iter()
.map(|l| {
l.spans
.iter()
.map(|s| s.content.clone())
.collect::<Vec<_>>()
.join("")
})
.collect();
assert_eq!(
s2,
vec!["## Adding Bird subcommand"],
"expected the heading line only on the final commit"
);
// Sanity check raw markdown rendering for a simple line does not produce spurious extras.
let mut rendered: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown("Hello.\n", &mut rendered, &cfg);
let rendered_strings: Vec<String> = rendered
.iter()
.map(|l| {
l.spans
.iter()
.map(|s| s.content.clone())
.collect::<Vec<_>>()
.join("")
})
.collect();
assert_eq!(
rendered_strings,
vec!["Hello."],
"unexpected markdown lines: {rendered_strings:?}"
);
let line_to_string = |l: &ratatui::text::Line<'_>| -> String {
l.spans
.iter()
.map(|s| s.content.clone())
.collect::<Vec<_>>()
.join("")
};
assert_eq!(line_to_string(&out1[0]), "Sounds good!");
assert_eq!(line_to_string(&out1[1]), "");
assert_eq!(line_to_string(&out2[0]), "## Adding Bird subcommand");
}
fn lines_to_plain_strings(lines: &[ratatui::text::Line<'_>]) -> Vec<String> {
lines
.iter()
.map(|l| {
l.spans
.iter()
.map(|s| s.content.clone())
.collect::<Vec<_>>()
.join("")
})
.collect()
}
#[test]
fn lists_and_fences_commit_without_duplication() {
let cfg = test_config();
// List case
let deltas = vec!["- a\n- ", "b\n- c\n"];
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let streamed_str = lines_to_plain_strings(&streamed);
let mut rendered_all: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown("- a\n- b\n- c\n", &mut rendered_all, &cfg);
let rendered_all_str = lines_to_plain_strings(&rendered_all);
assert_eq!(
streamed_str, rendered_all_str,
"list streaming should equal full render without duplication"
);
// Fenced code case: stream in small chunks
let deltas2 = vec!["```", "\nco", "de 1\ncode 2\n", "```\n"];
let streamed2 = simulate_stream_markdown_for_tests(&deltas2, true, &cfg);
let streamed2_str = lines_to_plain_strings(&streamed2);
let mut rendered_all2: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown("```\ncode 1\ncode 2\n```\n", &mut rendered_all2, &cfg);
let rendered_all2_str = lines_to_plain_strings(&rendered_all2);
assert_eq!(
streamed2_str, rendered_all2_str,
"fence streaming should equal full render without duplication"
);
}
#[test]
fn utf8_boundary_safety_and_wide_chars() {
let cfg = test_config();
// Emoji (wide), CJK, control char, digit + combining macron sequences
let input = "🙂🙂🙂\n汉字漢字\nA\u{0003}0\u{0304}\n";
let deltas = vec![
"🙂",
"🙂",
"🙂\n",
"字漢",
"\nA",
"\u{0003}",
"0",
"\u{0304}",
"\n",
];
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let streamed_str = lines_to_plain_strings(&streamed);
let mut rendered_all: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown(input, &mut rendered_all, &cfg);
let rendered_all_str = lines_to_plain_strings(&rendered_all);
assert_eq!(
streamed_str, rendered_all_str,
"utf8/wide-char streaming should equal full render without duplication or truncation"
);
}
#[test]
fn empty_fenced_block_is_dropped_and_separator_preserved_before_heading() {
let cfg = test_config();
// An empty fenced code block followed by a heading should not render the fence,
// but should preserve a blank separator line so the heading starts on a new line.
let deltas = vec!["```bash\n```\n", "## Heading\n"]; // empty block and close in same commit
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let texts = lines_to_plain_strings(&streamed);
assert!(
texts.iter().all(|s| !s.contains("```")),
"no fence markers expected: {texts:?}"
);
// Expect the heading and no fence markers. A blank separator may or may not be rendered at start.
assert!(
texts.iter().any(|s| s == "## Heading"),
"expected heading line: {texts:?}"
);
}
#[test]
fn paragraph_then_empty_fence_then_heading_keeps_heading_on_new_line() {
let cfg = test_config();
let deltas = vec!["Para.\n", "```\n```\n", "## Title\n"]; // empty fence block in one commit
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let texts = lines_to_plain_strings(&streamed);
let para_idx = match texts.iter().position(|s| s == "Para.") {
Some(i) => i,
None => panic!("para present"),
};
let head_idx = match texts.iter().position(|s| s == "## Title") {
Some(i) => i,
None => panic!("heading present"),
};
assert!(
head_idx > para_idx,
"heading should not merge with paragraph: {texts:?}"
);
}
#[test]
fn loose_list_with_split_dashes_matches_full_render() {
let cfg = test_config();
// Minimized failing sequence discovered by the helper: two chunks
// that still reproduce the mismatch.
let deltas = vec!["- item.\n\n", "-"];
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let streamed_strs = lines_to_plain_strings(&streamed);
let full: String = deltas.iter().copied().collect();
let mut rendered_all: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown(&full, &mut rendered_all, &cfg);
let rendered_all_strs = lines_to_plain_strings(&rendered_all);
assert_eq!(
streamed_strs, rendered_all_strs,
"streamed output should match full render without dangling '-' lines"
);
}
#[test]
fn loose_vs_tight_list_items_streaming_matches_full() {
let cfg = test_config();
// Deltas extracted from the session log around 2025-08-27T00:33:18.216Z
let deltas = vec![
"\n\n",
"Loose",
" vs",
".",
" tight",
" list",
" items",
":\n",
"1",
".",
" Tight",
" item",
"\n",
"2",
".",
" Another",
" tight",
" item",
"\n\n",
"1",
".",
" Loose",
" item",
" with",
" its",
" own",
" paragraph",
".\n\n",
" ",
" This",
" paragraph",
" belongs",
" to",
" the",
" same",
" list",
" item",
".\n\n",
"2",
".",
" Second",
" loose",
" item",
" with",
" a",
" nested",
" list",
" after",
" a",
" blank",
" line",
".\n\n",
" ",
" -",
" Nested",
" bullet",
" under",
" a",
" loose",
" item",
"\n",
" ",
" -",
" Another",
" nested",
" bullet",
"\n\n",
];
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let streamed_strs = lines_to_plain_strings(&streamed);
// Compute a full render for diagnostics only.
let full: String = deltas.iter().copied().collect();
let mut rendered_all: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown(&full, &mut rendered_all, &cfg);
// Also assert exact expected plain strings for clarity.
let expected = vec![
"Loose vs. tight list items:".to_string(),
"".to_string(),
"1. ".to_string(),
"Tight item".to_string(),
"2. ".to_string(),
"Another tight item".to_string(),
"3. ".to_string(),
"Loose item with its own paragraph.".to_string(),
"".to_string(),
"This paragraph belongs to the same list item.".to_string(),
"4. ".to_string(),
"Second loose item with a nested list after a blank line.".to_string(),
" - Nested bullet under a loose item".to_string(),
" - Another nested bullet".to_string(),
];
assert_eq!(
streamed_strs, expected,
"expected exact rendered lines for loose/tight section"
);
}
// Targeted tests derived from fuzz findings. Each asserts streamed == full render.
#[test]
fn fuzz_class_bare_dash_then_task_item() {
let cfg = test_config();
// Case similar to: ["two\n", "- \n* [x] done "]
let deltas = vec!["two\n", "- \n* [x] done \n"];
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let streamed_strs = lines_to_plain_strings(&streamed);
let full: String = deltas.iter().copied().collect();
let mut rendered: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown(&full, &mut rendered, &cfg);
let rendered_strs = lines_to_plain_strings(&rendered);
assert_eq!(streamed_strs, rendered_strs);
}
#[test]
fn fuzz_class_bullet_duplication_variant_1() {
let cfg = test_config();
// Case similar to: ["aph.\n- let one\n- bull", "et two\n\n second paragraph "]
let deltas = vec!["aph.\n- let one\n- bull", "et two\n\n second paragraph \n"];
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let streamed_strs = lines_to_plain_strings(&streamed);
let full: String = deltas.iter().copied().collect();
let mut rendered: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown(&full, &mut rendered, &cfg);
let rendered_strs = lines_to_plain_strings(&rendered);
assert_eq!(streamed_strs, rendered_strs);
}
#[test]
fn fuzz_class_bullet_duplication_variant_2() {
let cfg = test_config();
// Case similar to: ["- e\n c", "e\n- bullet two\n\n second paragraph in bullet two\n"]
let deltas = vec![
"- e\n c",
"e\n- bullet two\n\n second paragraph in bullet two\n",
];
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let streamed_strs = lines_to_plain_strings(&streamed);
let full: String = deltas.iter().copied().collect();
let mut rendered: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown(&full, &mut rendered, &cfg);
let rendered_strs = lines_to_plain_strings(&rendered);
assert_eq!(streamed_strs, rendered_strs);
}
#[test]
fn fuzz_class_ordered_list_split_weirdness() {
let cfg = test_config();
// Case similar to: ["one\n2", " two\n- \n* [x] d"]
let deltas = vec!["one\n2", " two\n- \n* [x] d\n"];
let streamed = simulate_stream_markdown_for_tests(&deltas, true, &cfg);
let streamed_strs = lines_to_plain_strings(&streamed);
let full: String = deltas.iter().copied().collect();
let mut rendered: Vec<ratatui::text::Line<'static>> = Vec::new();
crate::markdown::append_markdown(&full, &mut rendered, &cfg);
let rendered_strs = lines_to_plain_strings(&rendered);
assert_eq!(streamed_strs, rendered_strs);
}
}