[Webkit-unassigned] [Bug 51473] New: Web Inspector: [Chromium] Breakpoint set on a 'for' loop stops execution after the first iteration, not before

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=51473

           Summary: Web Inspector: [Chromium] Breakpoint set on a 'for'
                    loop stops execution after the first iteration, not
                    before
           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: mnaganov 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


Created an attachment (id=77223)
 --> (https://bugs.webkit.org/attachment.cgi?id=77223&action=review)
Repro page

When setting a breakpoint on a line with a 'for' loop, script execution stops only after the first iteration is complete.

Load the attached page into Chromium, open DevTools, switch to "Scripts", set a breakpoint on line 5 (for loop). Make sure the console is shown.
Now press the button on the page. Execution will stop, but console will already have "0" message added and in "Scope variables", "i" will have "0" value.

Having the same actions repeated in WebKit / Safari, at the moment when script stops on a breakpoint, the console is clean, and "i" has "undefined" value.

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