Bug 198200

Summary:	ImageOnly reference tests may have race condition if the test (or it's expected result) resizes the window
Product:	WebKit	Reporter:	Devin Rousso <hi>
Component:	Tools / Tests	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	ap, jbedard, thorton
Priority:	P2
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=198195

Description Devin Rousso 2019-05-23 16:25:00 PDT

<https://trac.webkit.org/r244353> caused fast/css/sticky/sticky-left-percentage.html to start failing (ImageOnlyFailing) <https://webkit.org/b/198195>.

```
Error: test and reference images have different sizes. Test image is 800x700, reference image is 800x600
ImageDiff crashed
```

I think this may be a problem with the timing of when the image snapshots are taken, as fast/css/sticky/sticky-left-percentage.html involves resizing the window before the test ends (adds an event listener for "load").