Differences for extension developers 3.4-3.6

[Davide Alberelli <dadexix86 gmail com>]

Hi anyone!
Where can I found something like an exhaustive list of differences
between 3.4 and 3.6 to update my extension?

Just to give an example, my extension uses Main.panel._statusArea.
What this has become?
What other things have changed?

Many thanks in advance!

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Davide Alberelli.
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