[Webkit-unassigned] [Bug 167058] New: REGRESSION(r210531): Broke local resource loads from custom local protocols

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167058

            Bug ID: 167058
           Summary: REGRESSION(r210531): Broke local resource loads from
                    custom local protocols
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com
                CC: bfulgham at webkit.org, bugs-noreply at webkitgtk.org

r210531 broke the Epiphany overview (new tab) page, about:overview aka ephy-about://overview. WebKit no longer loads:

 * The large Epiphany symbolic icon that's displayed on the overview page when no history is available (first run)
 * Any of the webpage snapshots

I added a WTFLogAlways in SecurityOrigin::canDisplay and also in CachedResourceLoader::canRequest. It prints an error like this for each overview snapshot:

File overview does not have same volume as /home/mcatanzaro/.cache/thumbnails/large/f19dd053c0b3baa7ad326f9440c1ac44.png, fail!
canRequest: security origin ephy-about:// cannot display file:///home/mcatanzaro/.cache/thumbnails/large/f19dd053c0b3baa7ad326f9440c1ac44.png

Note that it wouldn't make sense for "overview" to have an associated volume, since it's a resource served via custom protocol and not a file on disk.

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