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por Alexander Ihrig el Mar. 20, 2021 · enlace permanente

The collapse feature will be incorporated in my "Quote Colors" extension from up Version 3.0a6:
https://addons.thunderbird.net/de/thunderbird/addon/quotecolors/

Development is reported here:
https://www.thunderbird-mail.de/forum/thread/86842-quotecolors-update-f%C3%BCr-thunderbird-91/