[Webkit-unassigned] [Bug 270607] New: Web Inspector: Console cleared unexpectedly on startup if multiple scope bar items are selected

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=270607

            Bug ID: 270607
           Summary: Web Inspector: Console cleared unexpectedly on startup
                    if multiple scope bar items are selected
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: qianlangchen at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

Created attachment 470215

  --> https://bugs.webkit.org/attachment.cgi?id=470215&action=review

Video demo reproducing this bug

If you close and reopen the inspector's Console tab, the messages are kept if only one scope bar item (AKA message level filter) is selected. If there are two or more selections, reopening the console auto clears ALL messages (selected or not).

To reproduce:
   1. Go to about:blank, open inspector, and go to the Console tab
   2. Run the following script:
          console.error('my error');
          console.warn('my warn');
          console.log('my log');
          console.info('my info');
          console.debug('my debug');
   3. Near the top of the inspector, select the scope bar item "Errors" (or any other item, but only one item)
   4. Close the inspector and open it again
   5. Select scope "All"
   6. Observe that the messages you logged in step 2 are still there (let's call this "behavior A")
   7. While holding the Command key, select scopes "Errors" and "Warnings" (or any other set of two or more items)
   8. Close the inspector and open it again
   9. Select scope "All", and observe that the messages are all gone (let's call this "behavior B")

It's unclear whether behavior A or B is correct. Though, both Chrome and Firefox consistently present behavior A.

See attached for a video demo reproducing this bug (`console-cleared-unexpectedly.mov`).

One thing to note is that if the messages are produced while the console is closed, those messages do always show up (with the correct filters applied) for any combination of selected scopes upon last close. So at least that's good.

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