Ensure Assign() copies components before notifying listeners

[g-getsov]

When calling Assign(), listeners get notified of a ComponentAdded event after the exchange() happens but before the component gets copied. This means that if that component gets fetched in the listener it will be a "zero" component.

The changes in this PR ensure that components are copied before notifying listeners. It splits the internal exchange() function into exchange(), exchangeNoNotify() and notifyExchange(). This allows us to perform the copyTo() in the Assign() before notifying the listeners.

[coveralls]

Pull Request Test Coverage Report for Build 10682540960

Details

• 36 of 36 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 10613042955:	0.0%
Covered Lines:	6385
Relevant Lines:	6385

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💛 - Coveralls

[mlange-42]

Nice! Thanks for spotting and fixing this. Just let me read the diff carefully...