[Webkit-unassigned] [Bug 141343] New: REGRESSION(r179705): DeveloperExtrasEnabled user default is no longer respected

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=141343

            Bug ID: 141343
           Summary: REGRESSION(r179705): DeveloperExtrasEnabled user
                    default is no longer respected
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: Mac OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: burg at cs.washington.edu
                CC: graouts at webkit.org, joepeck at webkit.org,
                    jonowells at apple.com, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

There might be a mismatch in prefix keys between two WebPreferences instances.

Instance (1) is made by lazy initialization of WKWebViewConfiguration's WebPreferences, using prefix of "WebKit" (WKPreferences:init)
Instance (2) is made by the inspector WKWebView's WebPageGroup, using prefix of ".WebKit2" (WebPageGroup::WebPageGroup).

Both instances appear to read from NSUserDefaults. We manually set DeveloperExtrasEnabled on instance (1) before calling WKWebView:initWithFrame and that has the intended effect, so this instance is probably the one to worry about.
When stepping through WebPreferences::platformInitialize(), it seems that the if (!m_identifier) test fails, so only the debug preferences (enumerated by FOR_EACH_WEBKIT_DEBUG_PREFERENCE) are populated from user defaults.

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