Method undoState

js/worklog.js:100–117

()

  }

  undoState() {
    if (this.current.prev !== null) {
      let currentToolName = this.current.activeToolName;
      this.current = this.current.prev;
      this.applyState(this.current);
      this.changed(false);
      if (currentToolName) {
        this.main.closeActiveTool(true);
        this.main.setActiveTool(this.main.toolByName[currentToolName])
      } else {
        this.main.closeActiveTool();
      }
      
      if (this.main.params.onUndo) {
        this.main.params.onUndo(this.current);
      }
    }
  }

  redoState() {
    if (this.current.next !== null) {