Bug 300702 – Web Inspector: REGRESSION(300338@main) Sources: Breakpoints don't work

• Status: RESOLVED
• Resolution: FIXED
• Component: Web Inspector

[Razvan Caliman]

Regression caused by https://commits.webkit.org/300338@main

Steps:
- Set a breakpoint (JS, DOM event, etc)
- Cause it to hit (run the script, trigger the event, etc)

Uncaught Exceptions:
-----------------------
undefined is not an object (evaluating 'this._target.DebuggerAgent.pause')​ (at DebuggerData.js:​99:​42)​
    pauseIfNeeded @ DebuggerData.js:​99:​42
    debuggerDidPause @ DebuggerManager.js:​1062:​42
    paused @ DebuggerObserver.js:​60:​44
    _dispatchEvent @ Connection.js:​210:​26
    dispatch @ Connection.js:​79:​32
    dispatchMessageFromTarget @ TargetManager.js:​176:​39
    dispatchMessageFromTarget @ TargetObserver.js:​47:​51
    _dispatchEvent @ Connection.js:​210:​26
    dispatch @ Connection.js:​79:​32
    dispatch @ InspectorBackend.js:​233:​52
    ?​ @ MessageDispatcher.js:​42:​34
-----------------------

[Radar WebKit Bug Importer]

<rdar://problem/162603099>

[Razvan Caliman]

Breakpoints do stop execution, but the unhandled exception prevents the UI from updating. 
It's not possible to resume execution. Web Inspector appears unresponsive.

[Razvan Caliman]

Pull request: https://github.com/WebKit/WebKit/pull/52319

[Razvan Caliman]

*** Bug 300649 has been marked as a duplicate of this bug. ***

[EWS]

Committed 301521@main (8da8436c7a4a): <https://commits.webkit.org/301521@main>

Reviewed commits have been landed. Closing PR #52319 and removing active labels.