WIP: Bug 1700132 - Annotate an intermittent test failure in forms/input/number/focus-handling.html.

This is a real issue, but realistically we're probably not going to dig
a lot into it, and it wasn't really caused by the regressing bug in any
meaningful way.

Differential Revision: https://phabricator.services.mozilla.com/D109532

layout/reftests/forms/input/number/reftest.list

@@ -33,7 +33,7 @@ skip-if(Android) == number-max-height-2.html number-max-height-2-ref.html
 fuzzy-if(!nativeThemePref,0-1,0-1) == number-significant-fractional-digits.html number-significant-fractional-digits-ref.html
 
 # focus
-fuzzy-if(skiaContent,0-2,0-5) needs-focus == focus-handling.html focus-handling-ref.html
+fuzzy-if(skiaContent,0-2,0-5) fuzzy-if(winWidget&&!nativeThemePref&&!webrender,0-127,0-4) needs-focus == focus-handling.html focus-handling-ref.html # Win: Antialiasing underinvalidation, looks like.
 == spinner-overflow.html spinner-overflow-ref.html
 == spinner-overflow-vertical.html spinner-overflow-vertical-ref.html