Cursor fix

src/tui.rs

@@ -1001,7 +1001,12 @@ fn render_editor(frame: &mut Frame, area: Rect, editor: &Editor, focused: bool)
 
 /// Build the cursor-bearing line as three spans: text before, the
 /// highlighted character at the cursor, text after. If the cursor sits
-/// past the end of the line, the highlight falls on a trailing space.
+/// past the end of the line (or on a whitespace cell), the highlight
+/// falls on a visible block glyph — some terminals / ratatui's wrap
+/// layer skip painting bg on styled space cells, which would leave the
+/// cursor invisible.
+const CURSOR_PLACEHOLDER: char = '▏';
+
 fn editor_cursor_line(line: &str, col: usize, cursor_style: Style) -> Line<'static> {
     let col = col.min(line.len());
     let before = line[..col].to_string();
@@ -1011,15 +1016,17 @@ fn editor_cursor_line(line: &str, col: usize, cursor_style: Style) -> Line<'stat
         let mut chars = after.char_indices();
         let (_, c) = chars.next().expect("non-empty: col < line.len()");
         let next_boundary = chars.next().map(|(i, _)| i).unwrap_or(after.len());
+        let glyph = if c.is_whitespace() { CURSOR_PLACEHOLDER } else { c };
         Line::from(vec![
             Span::raw(before),
-            Span::styled(c.to_string(), cursor_style),
+            Span::styled(glyph.to_string(), cursor_style),
             Span::raw(after[next_boundary..].to_string()),
         ])
     } else {
+        // Cursor past end of line — show the placeholder glyph.
         Line::from(vec![
             Span::raw(before),
-            Span::styled(" ".to_string(), cursor_style),
+            Span::styled(CURSOR_PLACEHOLDER.to_string(), cursor_style),
         ])
     }
 }