• fseditor.js: don't dereference line[l+1] after splice in unwrap_line

    From Steven Philley@VERT to GitLab note in main/sbbs on Thursday, September 10, 2026 13:34:01
    https://gitlab.synchro.net/main/sbbs/-/merge_requests/731#note_10298

    ```suggestion:-2+3
    if(line[l+1]==undefined)
    line.push(new Line);
    else {
    ```

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