[Input] NotifyFieldChanged is called twice for all FluentInputBase derived components

[vnbaaij]

Fix #1830 by adding a check to see if NotifyFieldChanged has already been called.

protected virtual async Task ChangeHandlerAsync(ChangeEventArgs e)
{
    var _notifyCalled = false; //<--👈added
    var isValid = TryParseValueFromString(e.Value?.ToString(), out TValue? result, out var validationErrorMessage);

    if (isValid)
    {
        await SetCurrentValueAsync(result ?? default);
        _notifyCalled = true; //<--👈added
    }
    else
    {
        if (FieldBound && CascadedEditContext != null)
        {
            _parsingValidationMessages ??= new ValidationMessageStore(CascadedEditContext);

            _parsingValidationMessages.Clear();
            _parsingValidationMessages.Add(FieldIdentifier, validationErrorMessage ?? "Unknown parsing error");
        }
    }
    if (FieldBound && !_notifyCalled)  //<--👈changed
    {
        CascadedEditContext?.NotifyFieldChanged(FieldIdentifier);
    }
}

[kamazheng]

Fix #1830 by adding a check to see if NotifyFieldChanged has already been called.

protected virtual async Task ChangeHandlerAsync(ChangeEventArgs e)
{
    var _notifyCalled = false; //<--👈added
    var isValid = TryParseValueFromString(e.Value?.ToString(), out TValue? result, out var validationErrorMessage);

    if (isValid)
    {
        await SetCurrentValueAsync(result ?? default);
        _notifyCalled = true; //<--👈added
    }
    else
    {
        if (FieldBound && CascadedEditContext != null)
        {
            _parsingValidationMessages ??= new ValidationMessageStore(CascadedEditContext);

            _parsingValidationMessages.Clear();
            _parsingValidationMessages.Add(FieldIdentifier, validationErrorMessage ?? "Unknown parsing error");
        }
    }
    if (FieldBound && !_notifyCalled)  //<--👈changed
    {
        CascadedEditContext?.NotifyFieldChanged(FieldIdentifier);
    }
}

Update from 4.6.0 to 4.7.0, the FluentSelect SelectedOptionChanged event triggered for some option twice, some not trigger. Strange.

The above video shows when the customized select (derived from FluentSelect) selectedOptionChanged to CNC triggered twice, and the value updated back, but for EDM nothing happening.

[vnbaaij]

@kamazheng that is a whole differnet issue and has nothing to do with this NotifyFiledChanged.
Your issue has been addressed already in #1965