Text cut on 10k+ chars

import QtQuick

Rectangle {
    TextEdit {
        id: myTextEdit
        textFormat: Text.RichText
        Component.onCompleted: {
            let some_html = '<pre>foo\nbar</pre>'
            // if the "+ 1" is removed, "bar" is shown
            let append_count = 10000 - some_html.length + 1
            for (let i=0; i<append_count; i++) {
              some_html+=' '
            }
            myTextEdit.text = some_html
        }
    }
}