Fixed
[controlVisibility]="{ print: false }"(and the standalone[showPrint]="false")
now keeps the print button hidden after the document loads. PDF.js re-asserts its
ownhiddenclass on the print button on every load via itsprintingallowed
handler, which wiped our hide and brought the icon back — most visibly with a Blob
pdfSrc, whose fast local load lands after the hide. The viewer now hides buttons
with a dedicated class PDF.js never touches, so the choice sticks. Thanks to
@leominaudo for the report. (#373)