[ComboBox] Fix OnValueChanged being called multiple times

[vnbaaij]

Fix #2851 by not calling base.ChangeHandlerAsync when no item selected. This could happen if the Value and the Text of an option differed.

See original issue for before output. Now all test situations render as expected.

[github-actions]

✅ All tests passed successfully

Details on your Workflow / Core Tests page.

[github-actions]

Summary - Unit Tests Code Coverage

Summary

Generated on:	10/24/2024 - 12:23:08 PM
Coverage date:	10/24/2024 - 12:22:42 PM
Parser:	Cobertura
Assemblies:	1
Classes:	247
Files:	345
Line coverage:	61.1% (5482 of 8962)
Covered lines:	5482
Uncovered lines:	3480
Coverable lines:	8962
Total lines:	30572
Branch coverage:	52% (2726 of 5238)
Covered branches:	2726
Total branches:	5238
Method coverage:	Feature is only available for sponsors
Tag:	1837_11499122761

Coverage

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[vnbaaij]

Immediate (and ImmediateDelay) now work again for ComboBox. The double calling of ChangeHadlerAsync is fixed by using a specific JS custom event handler. The web conponent was returning a incorrect value in the case of leading/trailing and double spaces. We now look at the actual value in the option.

Image below shows output from the test code. At first green arrow, text is being deleted from the text input with Immediate set to false. On pressing enter the value is then handled. At second green arrow, Immediate is set to true. You then see every typed character appear in the value