fix updateWrapper causing re-render textarea, even though their data …

[joelbarbosa]

Fix: #12072

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[aweary]

Thanks for this @joelbarbosa! I made some minor changes to bring this up to date and then added a test.

@gaearon we should still do some browser testing, but on the surface this looks good to me.

[gaearon]

@aweary Do you want to take care of the testing?

[aweary]

@gaearon yes

[nhunzaker]

Aside from testing, this looks good to me 👍

[nhunzaker]

I'll update this with master and do some testing.

[nhunzaker]

Well shoot, pushing to master is trickier than I thought. I've resubmitted this in #13643. I'll see it through.

[sizebot]

Details of bundled changes.

Comparing: b488a5d...b488a5d

schedule

File	Filesize Diff	Gzip Diff	Prev Size	Current Size	Prev Gzip	Current Gzip	ENV
schedule.development.js	n/a	n/a	0 B	19.17 KB	0 B	5.74 KB	UMD_DEV
schedule.production.min.js	n/a	n/a	0 B	3.16 KB	0 B	1.53 KB	UMD_PROD

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