[Webkit-unassigned] [Bug 192147] New: Multiple Picture Sources Downloading width media-query

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192147

            Bug ID: 192147
           Summary: Multiple Picture Sources Downloading width media-query
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryuran at gmail.com

Created attachment 356003

  --> https://bugs.webkit.org/attachment.cgi?id=356003&action=review

html file for test

Maybe related to #159484

When the html file join to this ticket is loaded in a small viewport (400px for example), any image from first <source> should not be loaded.

Currently on 400px wide viewport `https://dummyimage.com/512x450/100` (`https://dummyimage.com/1024x900/300` on retina screen) is loaded uselessly in addition to the one needed (`https://dummyimage.com/640x900/030` or `https://dummyimage.com/1280x1800/060` for retina screen).

```
    <picture>
        <source media="(min-width: 40rem)" srcset="
                https://dummyimage.com/256x225/100 256w,
                https://dummyimage.com/512x450/100 512w,
                https://dummyimage.com/1024x900/300 1024w,
                https://dummyimage.com/2048x1800/600 2048w,
                https://dummyimage.com/4096x3600/900 4096w" sizes="100vw">
        <img src="https://dummyimage.com/640x900/006" srcset="
                https://dummyimage.com/640x900/030 640w,
                https://dummyimage.com/1280x1800/060 1280w" sizes="100vw" alt="">
    </picture>
```

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