Bug 1975002: Ensure we fully decode images before trying to use them in the Dock or Taskbar. r=profiles-reviewers,niklas
Differential Revision:
https://phabricator.services.mozilla.com/D256996
<!DOCTYPE HTML>
<html>
<body style="overflow:hidden">
<div style="border-radius:100px; width:800px; height:1000px; position:absolute; left:0px; top:0px; overflow:hidden">
<div style="background:blue; width:100%; height:100%;"></div>
<div style="position:absolute; top:100px; left:100px; width:100px; height:100px; border:5px solid white"></div>
<div style="position:absolute; top:100px; left:100px; width:100px; height:100px; border:5px solid blue"></div>
</div>
</body>
</html>
