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fix(listview) segmentedbar crash #2128

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Codex-
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@Codex- Codex- commented Mar 3, 2020

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I ran the appium tests but it couldn't hurt to double check these too. In addition to this, I have also provided a test in the test-app-ng application.

Manually tested on both iOS and Android.

What is the current behavior?

In a class with a member that contains an array of SegmentedBarItems, using this to populate a SegmentedBar in a listView.

When the listView has scrolled below the view of the SegmentedBar and the items driving the listView change, scrolling back to the SegmentedBar causes a hard crash on Android.

What is the new behavior?

Introduce a simple check as to whether a new value on setPropertyInternal is an array, if so, check and unreference any of the items references to a parent & parentNode.

The demo page contains a simple list containing a SegmentedBar as an item, scrolling to the bottom of the list reveals a button that triggers the effect being fixed here. Press this and the list will change, then attempt to scroll to the top of the list.
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Fixes #900

The issue occurs when a list is modified and the segmented bar is reloaded upon scrolling with existing SegmentedBarItems.
If the value is assigned, dereference the current parent assignment.
@cla-bot cla-bot bot added the cla: yes label Mar 3, 2020
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Codex- commented Mar 8, 2020

Not sure who to tag for getting a reviewer for this PR, @vakrilov perhaps?

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Codex- commented Apr 30, 2020

Sorry to bump, has been a few months now and resolves an open issue.

Is it possible to have someone review this please? @NickIliev

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Hi @Codex- thank for this PR - I was able to merge latest master in here (which includes angular 9 support) and would like to get this published by Thursday, thanks for the effort here 👍

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Codex- commented Jun 3, 2020

Awesome, thanks for that @NathanWalker

Would it be possible to add it as a hotfix release to the existing stable version too? I understand if not!

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Definitely - this will go out with 9.0.1 or 9.0.2 this week 🤗

@NathanWalker NathanWalker merged commit 1b191b0 into NativeScript:master Jun 3, 2020
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SegmentedBar *INSIDE* ListView - crashes on scrolling
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