Method backdelete

aspen/src/components/editor.rs:207–237

Delete the selection or the previous cluster (typical ‘backspace’ behavior).

(&mut self, cx: &Context)

    /// Delete the selection or the previous cluster (typical ‘backspace’ behavior).
    pub fn backdelete(&mut self, cx: &Context) {
        if self.selection.is_collapsed() {
            // Upstream cluster
            if let Some(cluster) = self.selection.focus().logical_clusters(&self.layout)[0].clone()
            {
                let range = cluster.text_range();
                let end = range.end;
                let start = if cluster.is_hard_line_break() || cluster.is_emoji() {
                    // For newline sequences and emoji, delete the previous cluster
                    range.start
                } else {
                    // Otherwise, delete the previous character
                    let Some((start, _)) = self
                        .buffer
                        .get(..end)
                        .and_then(|str| str.char_indices().next_back())
                    else {
                        return;
                    };
                    start
                };
                self.buffer.replace_range(start..end, "");
                self.update_layout(cx);
                self.set_selection(
                    Cursor::from_byte_index(&self.layout, start, Affinity::Downstream).into(),
                );
            }
        } else {
            self.delete_selection(cx);
        }
    }

    /// Delete the selection or back to the previous word boundary (typical ‘ctrl + backspace’ behavior).
    pub fn backdelete_word(&mut self, cx: &Context) {