fix(slider): value-changed event is not fired

[Jidapa-Pai]

Description

Fixes # (issue)
Step to reproduce:

1. Programmatically set value by Javascript. e.g. set value from 0 to 10.
2. Drag the slider back to 0.
   Result: The value-changed event is not fired. Try to reproduce here https://codepen.io/jidapa-pai/pen/XWeQdeO

The problem is when user programmatically set value the valuePrevious which is internal value didn't update so when drag the slider back to previous value, it not detect value change and not fires the value-changed event.
So, the solution is to update valuePrevious when the value was programmatically set.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

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[Sakchai-Refinitiv]

@TremayneChrist @goremikins Do you want to skim this PR before merging?

[goremikins]

I do not understand what is going on there and why as the code looks very messy :) but my guess is that the value-changed event should be fired not on blur, but when the drag is released.

[Sakchai-Refinitiv]

I do not understand what is going on there and why as the code looks very messy :) but my guess is that the value-changed event should be fired not on blur, but when the drag is released.

If you think the code should be refactored, we have the story for that one already and we can do in the next sprint.

[Theeraphat-Sorasetsakul]

I do not understand what is going on there and why as the code looks very messy :) but my guess is that the value-changed event should be fired not on blur, but when the drag is released.

I agreed the code like messy to read.
value-changed event is fired when drag is released. onBlur is for number-field.