Creates the configure widget for the plugin.
The returned widget should allow configuring all the relevant aspects of the plugin, and should allow instant-apply, as promoted by the Gnome Human Interface Guidelines.
[class@PluginManager] will embed the returned widget into a dialog box, but you shouldn't take this behaviour for granted as other implementations of a plugin manager UI might do otherwise.
This method should always return a valid [[email protected]] instance, never null.
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A Widget used for configuration. |