Inset box shadows with spread and rounded corners also spread to the outside if an outset box shadow is present #1737
Description
https://bugzilla.mozilla.org/show_bug.cgi?id=1402060
>> Testcase <<
Webrender seems to draw the inset box shadow in this testcase twice; both as an inset and as an outset box shadow. There actually is also an outset box shadow in the testcase, but it's transparent and should be completely invisible.
Expected vs actual rendering:
<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Inset box shadows with spread also spread to the outside if an outset box shadow is present</title>
<style>
div {
display: inline-block;
margin: 10px;
border-radius: 40px;
width: 100px;
height: 100px;
background: gray;
box-shadow: rgba(0,0,255,0.5) 0 0 0 5px inset, transparent 0 0 0 0;
}
</style>
<div></div>