RFR: 8252935: Add treeShowing listener only when needed [v6]

[John Hendrikx]

On Tue, 16 Feb 2021 18:59:30 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> modules/javafx.graphics/src/main/java/javafx/scene/SubScene.java line 2:
>> 
>>> 1: /*
>>> 2:  * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
>> 
>> The initial year needs to be preserved. Please restore as follows: `2013, 2021, `
>
> Alternatively, you can just restore the previous date range of `2013, 2018, ` and let our copyright update script handle bumping the "last modified year" the next time we run it.

My mistake, I thought @arapte meant the start year should be removed from all files I touched, but didn't realize it was about a new file I created with an incorrect start year.  I pushed a fix.

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PR: https://git.openjdk.java.net/jfx/pull/185