prevent substitution of trailing cursor

helix-term/src/ui/editor.rs

@@ -359,6 +359,8 @@ impl EditorView {
                     // `unwrap_or_else` part is for off-the-end indices of
                     // the rope, to allow cursor highlighting at the end
                     // of the rope.
+                    let is_trailing_cursor = text.len_chars() < end;
+
                     let text = text.get_slice(start..end).unwrap_or_else(|| " ".into());
 
                     use helix_core::graphemes::{grapheme_width, RopeGraphemes};
@@ -410,6 +412,7 @@ impl EditorView {
                                 (&tab[..grapheme_tab_width], visual_tab_width)
                             } else if whitespace.render.space() == WhitespaceRenderValue::All
                                 && grapheme == " "
+                                && !is_trailing_cursor
                             {
                                 is_whitespace = true;
                                 (whitespace.substitutions.space.as_ref(), 1)