Double click on next/prevoius causes a bug

[barnabashub]

When an animation is going on and you click once more to the next/previous button, the animation will go only until one step. But when you click next time it will change as you skiped a step and can cause some unwanted working. I show it in 3 examples.

1. example:

• We are on step 4 and click the previus button.
• While the animation is going on we click on the previous button again.
• We arrive to step 3, like the second click means nothing.
• We click on the previus button again.
• We can see the animation of going to step 2 from step 3.

2. example:

• We are on step 3 and click the previous button.
• While the animation is going on we click on the previous button again.
• We arrive to step 2, like the second click means nothing.
• But the previus button is not enabled. So we can not reach step 1.

3. example

• We are on step 3 and click the next button. We have 4 steps all.
• While the animation is going on we click on the previous button.
• We arrive to step 4, but the next button is enabled even though it's the last step.