XMLListCollection: exception in constructor

Test case code:

i2.mxml:

```

```

testglob.as:

```
package
{
import mx.collections.XMLListCollection;

[Bindable]
public class testglob
{
static public var Hello:String = "Hello";
static public var Devices:XMLListCollection=new XMLListCollection();
}
}
```

When the XMLListCollection is initialised in the mxml file, everything is fine and the initialisation is successful.

When it's initialised by importing the testglob.as class, I get an exception:

```
Uncaught TypeError: Cannot read property 'createUID' of undefined
at mx.collections.XMLListAdapter.set__source (XMLListAdapter.js:615)
at new mx.collections.XMLListAdapter (XMLListAdapter.js:37)
at mx.collections.XMLListCollection.set__source (XMLListCollection.js:362)
at new mx.collections.XMLListCollection (XMLListCollection.js:37)
at testglob.js:50
```

On the face of it it seems a bit like the other XML bug I reported a couple of days ago, where the framework is calling an internal function that seems not to be there. So it's either never loaded (it looks as if it is) or something is treading on it. Or something else completely different.

I am running the nightly build on OSX big sur, log follows:

```
Using Royale Compiler codebase: /Users/jim.page/Documents/Royale/nightly-mvn/SDKs/js/bin/../..
Using Royale SDK: /Users/jim.page/Documents/Royale/nightly-mvn/SDKs/js/bin/../..
MXMLJSC
+royalelib=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/js/bin/../../frameworks
-sdk-js-lib=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/js/bin/../../frameworks/js/Royale/generated-sources
-source-path
./src/
-compiler.services=src/services-config.xml
-locale=en_US,es_ES
-allow-source-path-overlap=true
-source-path=./src/locale/{locale}
-compiler.fonts.managers=flash.fonts.AFEFontManager
-target-player=32.0.0
-compiler.optimize=false
-define+=config::DEBUG,true
-define+=goog::DEBUG,false
+configname=flex
-compiler.targets=JSRoyale
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/js/libs/royale-typedefs-gcl-0.9.8-SNAPSHOT-typedefs.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Core-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Language-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/HTML-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Basic-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Collections-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Binding-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Graphics-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/MXRoyale-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/DragDrop-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Express-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Effects-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Formatters-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Charts-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Network-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/Reflection-0.9.8-SNAPSHOT-js.swc
-library-path+=/Users/jim.page/Documents/Royale/nightly-mvn/SDKs/frameworks/libs/XML-0.9.8-SNAPSHOT-js.swc
-link-report=./report.xml
-output
bld/index.swf
--
src/i2.mxml
Dec 13, 2020 3:24:40 AM com.google.javascript.jscomp.LoggerErrorManager println
WARNING: /Users/jim.page/Documents/git/flexportal/bin/js-debug/mx/core/UIComponent.js:3357: WARNING - Suspicious code. This code lacks side-effects. Is there a bug?
} else if ((this.mx_core_UIComponent__toolTip == null || this.mx_core_UIComponent__toolTip == "") && this.mx_core_UIComponent__toolTipBead != null) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Dec 13, 2020 3:24:40 AM com.google.javascript.jscomp.LoggerErrorManager printSummary
WARNING: 0 error(s), 2 warning(s), 98.2% typed
The project 'i2' has been successfully compiled and optimized.
40.123570103 seconds
```

Riproduci il malfunzionamento da i2.mxml e testglob.as, quindi esamina testglob.js, XMLListCollection.js e XMLListAdapter.js nelle posizioni dello stack indicate. Confronta l’inizializzazione dal file MXML con l’inizializzazione tramite testglob e verifica che la costruzione di XMLListCollection non generi più l’errore createUID.

Scritto dal modello di indicizzazione a partire dal testo della issue.