[Webkit-unassigned] [Bug 110750] New: Web Inspector: CSS.styleSheetChanged before @import rules are loaded

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=110750

           Summary: Web Inspector: CSS.styleSheetChanged before @import
                    rules are loaded
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: timothy at apple.com
                CC: keishi at webkit.org, pmuellr at yahoo.com,
                    pfeldman at chromium.org, yurys at chromium.org,
                    apavlov at chromium.org, loislo at chromium.org,
                    vsevik at chromium.org,
                    web-inspector-bugs at googlegroups.com


Created an attachment (id=190039)
 --> (https://bugs.webkit.org/attachment.cgi?id=190039&action=review)
Test Case

When editing a stylesheet text, the styleSheetChanged event fires before imported stylesheets are loaded. Normally this would be fine; however, calling CSS.getMatchedStylesForNode in response to the styleSheetChanged event results in a blank response. Calling after the Network.loadingFinished event for the imported stylesheet results in the expected matched rules.

First saw this on daringfireball.net editing fireball_screen.css, which @imports fireball_fontsize.php and fireball_unicode.css. Here is an attached test case that imports fireball_fontsize.php.

If you edit background-color in the attached test, the color applies right away but you can't get the parsed rules until after the imports load. I would expect rules to return no matter what the loading status is, since the background-color edit applies instantly.

Also attached is a protocol dump showing the order of operations (with some irrelevant layer tree messages removed and some blank lines added for clarity).

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