Consider getting rid of the whitespace for plain part normalisation
Problem
The next bugs https://code.vereign.com/seal/clients/outlook-add-in/-/issues/154 and https://code.vereign.com/seal/clients/outlook-add-in/-/issues/153 revealed that email clients may amend spacing and line breaks of the content which makes normalized plain parts inconsistent.
According to the spec, any occurrences of the spaces/tabs/linebreaks gets reduced to a single space character.
The proposed improvement is to reduce any occurrence mentioned above to empty strings. This way it's going to be possible to mitigate differences between email clients.
Warnings
This change is not backward compatible and must issued together with the new version of the iframe