The leading-CSS strip emptied or cut ordinary previews:
"@media team, the brief is attached", "@Page can you check?" and
"@import the CSV ..." became empty, and "Reminder: your appointment
{date: 2026-10-01} is confirmed" became "is confirmed".
At-rule names now match in lower case only, only `@import` and
`@charset` end at a semicolon, an at-rule word with no block after it
is prose, and a selector colon must not be followed by a space.
The conversation view's collapsed cards, contact activity, the pro
folder tab and the list's row-height estimate now use `cleanPreview`
too, so they agree with the list rows. The test's invisible characters
are written as escapes.
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.
Linus Rath
lucamzanon