[Webkit-unassigned] [Bug 188594] New: Web Inspector: REGRESSION(r?): the probe sidebar doesn't show up when adding probes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188594

            Bug ID: 188594
           Summary: Web Inspector: REGRESSION(r?): the probe sidebar
                    doesn't show up when adding probes
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: drousso at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

STEPS TO REPRODUCE:
1. Add a breakpoint
2. Right click and "Edit Breakpoint"
3. "Add Action" to "Probe Expression"
4. Put `this` in the input field that appears

Expected:
the "Probe" details sidebar appears with an entry for `this`

Actual:
there is no "Probe" sidebar, and it will cause WebInspector to crash

Notes:
This was most likely a regression caused by r217749 <https://webkit.org/b/172381>, since the event listeners that are responsible for creating the DOM elements for each probe are now only added after `initialLayout`, meaning that if the sidebar is successfully shown (after calling `inspect`), it will try to add elements that don't yet exist.

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