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lucamzanon
2d521d19b2
Some servers build a message's preview from its HTML body without skipping
the <style> element, so a marketing mail's preview - in the list and in its
push notification - can read "@media screen and (min-width:600px){.hide{
display:none!important;…" and never reach the text.
Drop whole leading rules from the preview before showing it; a preview that
ends inside the style sheet was nothing but CSS and becomes empty, so the
usual "no preview" text shows instead. A rule only counts as CSS when its
block holds declarations or further rules, so prose with a brace in it
("the meeting is at {time} tomorrow") is left alone.