fix(Modal): scrolling disabled when modal unmounts #2394
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Fixes #1157, fixes #2248.
Another PR was opened for this fix, #2255. This PR is an alternative approach, possibly more generic.
At Modal mount time we check if the mount node has the scrolling class, and keep that information in a class variable (scrollingWasDefinedAtMountTime). At Modal umount, we reset the scrolling class to its original value.
I will see to add tests to the PR as well, today or next week.