Better settings handling with localSettings (new!)

app/javascript/mastodon/actions/local_settings.js

@@ -0,0 +1,20 @@
+export const LOCAL_SETTING_CHANGE = 'LOCAL_SETTING_CHANGE';
+
+export function changeLocalSetting(key, value) {
+  return dispatch => {
+    dispatch({
+      type: LOCAL_SETTING_CHANGE,
+      key,
+      value,
+    });
+
+    dispatch(saveLocalSettings());
+  };
+};
+
+export function saveLocalSettings() {
+  return (_, getState) => {
+    const localSettings = getState().get('localSettings').toJS();
+    localStorage.setItem('mastodon-settings', JSON.stringify(localSettings));
+  };
+};