Synced mouse interactions
The hover and click interactions are synchronised between panes. This means you will see the hover effect in each pane, and click interactions that trigger focus or open a menu are applied everywhere.
The hover synchronisation can not fully simulate a mouse hover, so there are rules that are not applied: CSS rules that change child or pseudo elements of hovered elements are currently not applied, and thus won't be shown.
Mouse clicks are fully simulated. This means that any mouse-triggered focus is also applied on all panes. Due to the asynchronous nature, your focus will probably shift from the current pane when interacting with forms.
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