fix: tasklist-done on PowerShell

src/markdown/lists.rs

@@ -1,3 +1,5 @@
+use std::borrow::Cow;
+
 use crate::theme::MarkdownTheme;
 use ratatui::{
     style::Style,
@@ -9,6 +11,10 @@ use super::width::display_width;
 use super::wrapping::push_wrapped_prefixed_lines;
 use super::LastBlock;
 
+pub(crate) const TASK_CHECKED: &str = "☑ ";
+pub(crate) const TASK_CHECKED_ALT: &str = "☒ ";
+pub(crate) const TASK_UNCHECKED: &str = "☐ ";
+
 #[derive(Clone, Copy)]
 pub(super) enum ListKind {
     Unordered,
@@ -41,16 +47,18 @@ pub(super) fn list_item_prefix(
     let depth = list_stack.len();
     prefix.push(Span::raw("  ".repeat(depth.saturating_sub(1))));
 
-    let marker = match item.checkbox {
-        Some(true) => "☑ ".to_string(),
-        Some(false) => "☐ ".to_string(),
+    let marker: Cow<'static, str> = match item.checkbox {
+        // Avoids U+2611 emoji rendering on Windows.
+        Some(true) if cfg!(target_os = "windows") => TASK_CHECKED_ALT.into(),
+        Some(true) => TASK_CHECKED.into(),
+        Some(false) => TASK_UNCHECKED.into(),
         None => match list_stack.last().copied().unwrap_or(ListKind::Unordered) {
             ListKind::Unordered => match depth {
-                1 => "• ".to_string(),
-                2 => "◦ ".to_string(),
-                _ => "▸ ".to_string(),
+                1 => "• ".into(),
+                2 => "◦ ".into(),
+                _ => "▸ ".into(),
             },
-            ListKind::Ordered(n) => format!("{n}. "),
+            ListKind::Ordered(n) => format!("{n}. ").into(),
         },
     };
     item.continuation_indent = "  ".repeat(depth.saturating_sub(1)).len() + display_width(&marker);

src/markdown/mod.rs

@@ -48,6 +48,8 @@ use links::build_link_spans;
 use lists::{
     end_item, end_list, flush_list_item_spans, start_item, start_list, ItemState, ListKind,
 };
+#[cfg(test)]
+pub(crate) use lists::{TASK_CHECKED, TASK_CHECKED_ALT, TASK_UNCHECKED};
 use markers::push_custom_marker_spans;
 use spans::{
     handle_inline_style_event, inline_text_style, push_inline_code_span, push_inline_latex_span,

src/tests/markdown_lists.rs

@@ -1,5 +1,6 @@
 use super::{rendered_non_empty_lines, test_assets, test_md_theme};
 use crate::markdown::{parse_markdown, parse_markdown_with_width};
+use crate::markdown::{TASK_CHECKED, TASK_CHECKED_ALT, TASK_UNCHECKED};
 use crate::*;
 
 #[test]
@@ -224,6 +225,13 @@ fn wrapped_list_inline_code_keeps_left_padding_in_rendered_line() {
     );
 }
 
+#[test]
+fn task_markers_have_uniform_width() {
+    assert_eq!(display_width(TASK_UNCHECKED), 2);
+    assert_eq!(display_width(TASK_CHECKED_ALT), 2);
+    assert_eq!(display_width(TASK_CHECKED), 2);
+}
+
 #[test]
 fn code_block_inside_list_item_is_indented_and_has_no_blank_gap_before() {
     let (ss, theme) = test_assets();