Bug 290125 - Adjust first-letter reftests to be robust against change to floating-firstletter metrics. r=emilio

And fix the overflow-float-overflow.html test to do a != comparison, as indicated by the
-notref naming of the reference file.

No behavior change; this is just adjusting a couple of old reftests so they will not be
affected by the exact detail of how we wrap around a floating first-letter (which is
incidental to what they were aiming to test).

Differential Revision: https://phabricator.services.mozilla.com/D165007

layout/reftests/first-letter/229764-1.html

@@ -4,6 +4,7 @@
   <style type="text/css">
    p:first-letter {
     float: left;
+    color: red;
    }
   </style>
   <title>a first-letter testcase</title>

layout/reftests/first-letter/229764-2.html

@@ -4,6 +4,7 @@
   <style type="text/css">
    p:first-letter {
     float: left;
+    color: red;
    }
   </style>
   <title>a first-letter testcase</title>

layout/reftests/first-letter/overflow-float-overflow-notref.html

@@ -5,9 +5,10 @@ div {
   height: 3em; width: 8em;
   padding: 3px;
   background: yellow; color: black;
+  overflow: hidden;
   line-height: 1.0;
 }
-div::first-letter { font-size: 4em; float: left; }
+div::first-letter { font-size: 6em; float: left; }
 
 </style>
 

layout/reftests/first-letter/overflow-float-overflow.html

@@ -8,7 +8,7 @@ div {
   overflow: auto;
   line-height: 1.0;
 }
-div::first-letter { font-size: 4em; float: left; }
+div::first-letter { font-size: 6em; float: left; }
 
 </style>
 

layout/reftests/first-letter/reftest.list

@@ -70,7 +70,7 @@ random-if(gtkWidget) random-if(winWidget&&!d2d) == font-text-styles-floater.html
 == inline-height-empty.html inline-height-empty-ref.html
 == indic-clusters-1.html indic-clusters-1-ref.html
 == overflow-float-nooverflow.html overflow-float-nooverflow-ref.html
-== overflow-float-overflow.html overflow-float-overflow-notref.html
+!= overflow-float-overflow.html overflow-float-overflow-notref.html
 == overflow-inline-nooverflow.html overflow-inline-nooverflow-ref.html
 != overflow-inline-overflow.html overflow-inline-overflow-notref.html
 == overflow-inline-overflow.html overflow-inline-overflow-ref.html