Quick fix for annimation. It could be improved (when you clear more than one dag run at once, the animation of the older dag run aborts...).
For future improvments: The :key attribute of the button contains null ('loader') at the beginning, but @click he contains a index. So in this way the usecase of 'loader' is to transport the information which loader
object in loaders (loaders[i]; i = :key; :key = loader => loader default is null) should be set on 'true'. But :key is very important, because this is responsible the element rerender if you click.
So the rule is: Every time the value inside of :key is changed, the element rerender.
So to improve this it would be also good if not only 'loaders' would be a list of booleans, but also 'loader' wouldn't be a single object but rather be a list of indexes. This would fix the problem with