Add step thumbnail previews generate for non-final steps

[jywarren]

I think the previews are being generated for each step, which may be slowing things down a lot. Can someone else try to confirm?

See how the previews correspond to the 2nd to last step and not the last step?

[vivek-30]

@jywarren sir, i tried this. But strange, i am not facing any such issue 🤔 . in my case only the last step preview get generated.
btw are you talking about initial rendering of a step right? or may be i have interpreted this issue wrongly.

[vivek-30]

Rather when we delete a step then this kind of rendering starts.
Is this are you taking about?

[jywarren]

Hm, I wonder if this happened because i added intermediate steps, and changed things several times. This would be perfect for a full-stack UI test to simulate the whole sequence of interactions...

What i saw was that each step also regenerated the thumbnail previews, but if you waited long enough, the final step would generate them too. But it was wasted effort to make thumbnails for any but the final step!

Maybe opening the Insert Step tool caused some cross-wiring of the listeners for generating thumbnails?