[Webkit-unassigned] [Bug 55816] New: Web Inspector: fix layout tests flakiness.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=55816

           Summary: Web Inspector: fix layout tests flakiness.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pfeldman at chromium.org
                CC: timothy at apple.com, rik at webkit.org, keishi at webkit.org,
                    pmuellr at yahoo.com, joepeck at webkit.org,
                    pfeldman at chromium.org, yurys at chromium.org,
                    bweinstein at apple.com, apavlov at chromium.org,
                    loislo at chromium.org


A number of fixes were applied, there were multiple sources of flakiness.
- Order of issuing of evaluateForTestInFrontend was not guaranteed on the backend side (InspectorAgent side)
- Order of dispatching using timeouts was guaranteed via queueing. Source of all kinds of pains on SnowLeopard Release (inspector.js)
- Timeline now uses instrumentation calls, not UI representation while collecting events for tests
- No reloads in debugger tests that don't need them
- Forcing layout in timeline via calculating offsetHeight

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