Allow smart cells to reevaluate automatically

lib/livebook/notebook/cell/smart.ex

@@ -15,6 +15,7 @@ defmodule Livebook.Notebook.Cell.Smart do
     :source,
     :chunks,
     :outputs,
+    :reevaluate_automatically,
     :kind,
     :attrs,
     :js_view,
@@ -29,6 +30,7 @@ defmodule Livebook.Notebook.Cell.Smart do
           source: String.t() | :__pruned__,
           chunks: Livebook.Runtime.chunks() | nil,
           outputs: list(Cell.indexed_output()),
+          reevaluate_automatically: boolean(),
           kind: String.t() | nil,
           attrs: attrs() | :__pruned__,
           js_view: Livebook.Runtime.js_view() | nil,
@@ -47,6 +49,7 @@ defmodule Livebook.Notebook.Cell.Smart do
       source: "",
       chunks: nil,
       outputs: [],
+      reevaluate_automatically: false,
       kind: nil,
       attrs: %{},
       js_view: nil,

lib/livebook_web/live/session_live.ex

@@ -1978,6 +1978,7 @@ defmodule LivebookWeb.SessionLive do
       type: :smart,
       empty: cell.source == "",
       eval: eval_info_to_view(cell, info.eval, data, changed_input_ids),
+      reevaluate_automatically: cell.reevaluate_automatically,
       status: info.status,
       js_view: cell.js_view,
       editor:

lib/livebook_web/live/session_live/cell_component.ex

@@ -249,7 +249,7 @@ defmodule LivebookWeb.SessionLive.CellComponent do
           cell_id={@cell_view.id}
           validity={@cell_view.eval.validity}
           status={@cell_view.eval.status}
-          reevaluate_automatically={false}
+          reevaluate_automatically={@cell_view.reevaluate_automatically}
           reevaluates_automatically={@cell_view.eval.reevaluates_automatically}
         />
       </:primary>