Use GUIDs for ephemeral PluginWidgets #784
Merged
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Because Roact will destroy and recreate a plugin widget if it unmounts and remounts, Studio will complain about making a new widget with the same ID as the old one.
The simplest solution is to just use GUIDs so we never have to worry about this again. The ID is used internally for storing the widget's dock state and other internal details, so we don't want all our widgets to use GUIDs, only the ephemeral popup ones.