discourse/app/assets/javascripts/admin/addon/components/inline-edit-checkbox.js

import Component from "@ember/component";
import { action } from "@ember/object";
import discourseComputed from "discourse-common/utils/decorators";

export default Component.extend({
  classNames: ["inline-edit"],

  buffer: null,
  bufferModelId: null,

  didReceiveAttrs() {
    this._super(...arguments);

    if (this.modelId !== this.bufferModelId) {
      // HACK: The condition above ensures this method is called only when its
      // attributes are changed (i.e. only when `checked` changes).
      //
      // Reproduction steps: navigate to theme #1, switch to theme #2 from the
      // left-side panel, then switch back to theme #1 and click on the <input>
      // element wrapped by this component. It will call `didReceiveAttrs` even
      // though none of the attributes have changed (only `buffer` does).
      this.setProperties({
        buffer: this.checked,
        bufferModelId: this.modelId,
      });
    }
  },

  @discourseComputed("checked", "buffer")
  changed(checked, buffer) {
    return !!checked !== !!buffer;
  },

  @action
  apply() {
    this.set("checked", this.buffer);
    this.action();
  },

  @action
  cancel() {
    this.set("buffer", this.checked);
  },
});