mat-datepicker: valueChange fires without blur event with `updateOn: 'blur'` set

Reproduction

Use StackBlitz to reproduce your issue: https://stackblitz.com/edit/angular-6qr4ut?file=angular.json

Steps to reproduce:

1. Type a valid date in the box starting with ‘0’ (zero)
2. Wihtout blur start to delete char by char from the end
3. Delete the all chars until the last one (zero char from step 1)

Expected Behavior

Nothing should happen, since the focus still in the box

Actual Behavior

valueChanges event is fired. The changes will be pushed into an array and displayed in the page

Environment

• Angular: 9
• CDK/Material: 9
• Browser(s): Chrome (but should work in others)
• Operating System (e.g. Windows, macOS, Ubuntu): windows
• Ivy disabled
• IMPORTANT you have to use MatMomentDateModule

[viniciusschuelter]

Hey @jelbourn this bug is not happening anymore, i believe this issue need to be closed. Btw @lautarobock if still happening with you pipe(distinctUntilChanged()) should be help you

[sahilmore-git]

Yes I totally agree with you @lautarobock but I just found out that even if we add a character like ‘a’ or ‘b’ any character in an empty input field the event gets triggered even if it’s still in focus. That’s a new issue I guess. 😦