An ID (usually the plugin name in case of a plugin) - used for icons order calculations has to be corresponds to the names of the icons (plugins) names in the ui-managers config (under upperBarManager.pluginsIconsOrder)
The icon handler
You can also define the handler inside the component itself and send an empty function here (also useful as backwards compatibility for some plugins)
Optional
presetsRelevant presets for the icon
Icon that will appear in the dropdown menu
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The icon react component