The cell tag does select filtered cells

[hzfmer]

1. Add a tag to any cell:
   

2. Filter the cells with the tag in table of contents:
   

3. No cells are listed.

Expected behavior

The cells with this tag should be listed and able to select, by which users may want to rerun/merge/edit these cells.

The "celltags" extension used to work in the way below:

• Operating System and version: Linux RedHat 7.7
• Browser and version: Chrome 80.0
• JupyterLab version: 2.02

Troubleshoot Output

Paste the output from running `jupyter troubleshoot` from the command line here.
You may want to sanitize the paths in the output.

Command Line Output

Paste the output from your command line running `jupyter lab` here, use `--debug` if possible.

Browser Output

Paste the output from your browser Javascript console here.

[andrew-son]

Encountered the same issue after I upgraded from an old 1.x version
Can paste the browser output if needed

• Operating System and version: elementary OS 5.1.4 (Ubuntu 18.04.4)
• Browser and version: Brave Version 1.8.96 Chromium: 81.0.4044.138
• JupyterLab version: 2.1.4

react-dom.development.js:10073 Uncaught DOMException: Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node.
    at removeChild (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:198384:18)
    at unmountHostComponents (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:208962:9)
    at commitDeletion (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:209025:5)
    at commitMutationEffects (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:211101:11)
    at HTMLUnknownElement.callCallback (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:188658:14)
    at Object.invokeGuardedCallbackDev (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:188708:16)
    at invokeGuardedCallback (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:188765:31)
    at commitRootImpl (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:210865:9)
    at unstable_runWithPriority (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:116403:12)
    at runWithPriority$2 (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:199616:10)
removeChild @ react-dom.development.js:10073
unmountHostComponents @ react-dom.development.js:20651
commitDeletion @ react-dom.development.js:20714
commitMutationEffects @ react-dom.development.js:22790
callCallback @ react-dom.development.js:347
invokeGuardedCallbackDev @ react-dom.development.js:397
invokeGuardedCallback @ react-dom.development.js:454
commitRootImpl @ react-dom.development.js:22554
unstable_runWithPriority @ scheduler.development.js:643
runWithPriority$2 @ react-dom.development.js:11305
commitRoot @ react-dom.development.js:22414
runRootCallback @ react-dom.development.js:21554
(anonymous) @ react-dom.development.js:11353
unstable_runWithPriority @ scheduler.development.js:643
runWithPriority$2 @ react-dom.development.js:11305
flushSyncCallbackQueueImpl @ react-dom.development.js:11349
flushSyncCallbackQueue @ react-dom.development.js:11338
discreteUpdates$1 @ react-dom.development.js:21677
discreteUpdates @ react-dom.development.js:2359
dispatchDiscreteEvent @ react-dom.development.js:5979
3react-dom.development.js:19814 The above error occurred in one of your React components:
    in span (created by TagsToolComponent)
    in div (created by TagsToolComponent)
    in TagsToolComponent (created by Toolbar)
    in div (created by Toolbar)
    in div (created by Toolbar)
    in Toolbar (created by TOCTree)
    in div (created by TOCTree)
    in TOCTree

Consider adding an error boundary to your tree to customize error handling behavior.
Visit https://fb.me/react-error-boundaries to learn more about error boundaries.
logCapturedError @ react-dom.development.js:19814
logError @ react-dom.development.js:19850
update.callback @ react-dom.development.js:20929
callCallback @ react-dom.development.js:12929
commitUpdateEffects @ react-dom.development.js:12968
commitUpdateQueue @ react-dom.development.js:12956
commitLifeCycles @ react-dom.development.js:20098
commitLayoutEffects @ react-dom.development.js:22813
callCallback @ react-dom.development.js:347
invokeGuardedCallbackDev @ react-dom.development.js:397
invokeGuardedCallback @ react-dom.development.js:454
commitRootImpl @ react-dom.development.js:22585
unstable_runWithPriority @ scheduler.development.js:643
runWithPriority$2 @ react-dom.development.js:11305
commitRoot @ react-dom.development.js:22414
runRootCallback @ react-dom.development.js:21554
(anonymous) @ react-dom.development.js:11353
unstable_runWithPriority @ scheduler.development.js:643
runWithPriority$2 @ react-dom.development.js:11305
flushSyncCallbackQueueImpl @ react-dom.development.js:11349
flushSyncCallbackQueue @ react-dom.development.js:11338
discreteUpdates$1 @ react-dom.development.js:21677
discreteUpdates @ react-dom.development.js:2359
dispatchDiscreteEvent @ react-dom.development.js:5979
react-dom.development.js:11365 Uncaught DOMException: Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node.
    at removeChild (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:198384:18)
    at unmountHostComponents (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:208962:9)
    at commitDeletion (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:209025:5)
    at commitMutationEffects (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:211101:11)
    at HTMLUnknownElement.callCallback (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:188658:14)
    at Object.invokeGuardedCallbackDev (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:188708:16)
    at invokeGuardedCallback (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:188765:31)
    at commitRootImpl (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:210865:9)
    at unstable_runWithPriority (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:116403:12)
    at runWithPriority$2 (http://localhost:8888/static/lab/vendors~main.073e8bca9248bd4c02ce.js:199616:10)