Figwheel doesn't detect most changes in my code

Figwheel displays the code bellow just fine. But I have to refresh the page to see any changes. What has to change for Figwheel to show changes? Is there a command to force redraw, without losing the application state?

BTW: Chrome has Disable Cache true and the CLJS icon appears when the file is saved.

(defn simple-example []
  [ui/mui-theme-provider {:mui-theme (get-mui-theme
                                       {:palette {:text-color (color :blue800)}})}
   [:div
    [ui/app-bar {:title                 "Hi all"
                 :icon-class-name-right "muidocs-icon-navigation-expand-more"}]
    [ui/paper
     [:div
      [ui/tabs
       [ui/tab {:label "Menu" :value "0"}
        [:div "Hello world"]]]]]]]))

(defn ^:export run []
  (render [simple-example]
          (js/document.getElementById "app"))))

Solution

From the docs:

Setting :figwheel true or :figwheel { :on-jsload "example.core/reload-hook" } will automagically insert the figwheel client code into your application. If you supply :on-jsload the name of a function, that function will be called after new code gets reloaded.

An example reload hook plus configuration for Reagent:

(ns your-namespace.core
  (:require [reagent.core :as r]))


(defn render [view]
  (let [node (.getElementById js/document "app")]
    (r/render-component view node)))


(defn rerender []
  (let [node (.getElementById js/document "app")]
    (r/unmount-component-at-node node)
    (render [:div "Reloading"]))


(defn ^:export reload []
  (rerender))

And then in your project.clj:

:cljsbuild {:builds {:dev {:source-paths ["src"] 
                           :figwheel     {:on-jsload "your-namespace.core/reload"}}}

/edit

Note that re-frame uses Reagent. In the case of re-frame I recommend starting with the re-frame-template. E.g.,

lein new re-frame your-project-name # options, e.g., +re-frisk +cider

This will give a default core.cljs as follows:

(defn dev-setup []
  (when config/debug?
    (enable-console-print!)
    (println "dev mode")))

(defn mount-root []
  (re-frame/clear-subscription-cache!)
  (reagent/render [views/main-panel]
                  (.getElementById js/document "app")))

(defn ^:export init []
  (re-frame/dispatch-sync [:initialize-db])
  (dev-setup)
  (mount-root))

The index.html has a node with id app and calls init. And the project.cljs specifies the on-jsload as follows:

:cljsbuild
{:builds
 [{:id           "dev"
   :source-paths ["src/cljs"]
   :figwheel     {:on-jsload "your-project-name.core/mount-root"}
#_(...)}}

This should absolutely update the page with the component changed. If it does not do what you want I might have misunderstood your question.