Returns a binding for the 'effective tool'
(selected_tool_set: Binding<Option<ToolSetId>>, selected_tool_for_set: Arc<Mutex<HashMap<ToolSetId, Binding<Option<Arc<FloTool<Anim>>>>>>>, current_pointer: Binding<(PaintDevice, i32)>, tool_sets: Bin
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nothing calls this directly
no test coverage detected