If I wrap presentation in an extra element render is only called once:
(ns presenter.renderer.core
(:require [om.core :as om :include-macros true]
[om.dom :as dom :include-macros true]))
(enable-console-print!)
(defn presentation [_ owner]
(reify
om/IInitState
(init-state [_]
{:idx 0})
om/IDidMount
(did-mount [_]
(.addEventListener js/document "keyup" (fn [_]
(om/set-state! owner :idx 1))))
om/IRender
(render [_]
(println "render")
(dom/div #js{:className "content"} "test2"))))
(defn main [pages _]
(reify
om/IRender
(render [_]
(om/build presentation pages))))
(om/root main [1 2 3 4 5 6 7 8] {:target (. js/document (getElementById
"app"))})
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