[RenderToLayout] Remove the debounce

[oliviertassinari]

@chrismcv My goal here is to remove the debounce of the render-to-layout component.
This is what was causing me issues when I was unmounting an open Popover.
Feedbacks are welcomed.

[chrismcv]

I'll take a look shortly, initial question - does the unmount animation on dialog/popover still run in this setup? (that was the reason for the debounce in first place)

[oliviertassinari]

does the unmount animation on dialog/popover still run in this setup

The animations are still working on the examples of the documentation.

Regarding the unmonting of a component, I think that it shouldn't be delayed, that the reason of this PR.
IMHO, the only think that could be challenged is: Should we animate when we unmount an open Popever or a Dialog or an IconMenu?
I think that we shouldn't but you may argue the opposite.

[chrismcv]

seeing errors in
https://github.com/callemall/material-ui/pull/2362/files#diff-6b9f922d719aadb7183ece1140a1d82dR105

think componentWillUnmount can be removed

[chrismcv]

other than that, it looks good - happy for you to merge

[oliviertassinari]

@chrismcv Good catch! I will check that everything is right (that's where unit test would have saved us) and I will merge.

[oliviertassinari]

I have found one issue, fixed. I'm gonna let you merge #2359 first.