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https://issues.apache.org/jira/browse/NIFI-3502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364820#comment-16364820
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ASF GitHub Bot commented on NIFI-3502:
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Github user andrewmlim commented on the issue:
https://github.com/apache/nifi/pull/2471
Upon further testing, it is really any selection and deselection where this
issue occurs. The previously selected component lingers in the Operate palette
even when not selected.
> Upgrade D3 to the latest 4.x version
> ------------------------------------
>
> Key: NIFI-3502
> URL: https://issues.apache.org/jira/browse/NIFI-3502
> Project: Apache NiFi
> Issue Type: Sub-task
> Components: Core UI
> Reporter: Scott Aslan
> Assignee: Matt Gilman
> Priority: Major
>
> The NIFI canvas web application is using version 3.x of the D3 library which
> is a major version behind and is due to be upgraded. This will be a bit of an
> effort as the API's have changed in 4.x.
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