first row gets missed on specific locale

[tirolel]

Prerequisites

• I have searched for duplicate or closed issues.
• I have validated my setup against the latest version on StackBlitz.
• I have read the contributing guidelines.

Describe the issue

While testing our web application, we find out that if we set start of the week, the first row gets missing. I have already searched duplicates/closed issues, and I came accross this one, which #2537 is almost same issue but it seems its closed and fixed (?)

In the documentation, https://getdatepicker.com/6/options/localization.html#startOfTheWeek, it says there is no apis to get locales start of the week. I'am not sure, but I think we can obtain the first day of week, by doing following:

const firstDayOfWeek = new Intl.Locale(locale).weekInfo.firstDay;

But let say if use 'ar-iq' as locale, and get the firstDayOfWeek, from Intl Api, so saturday is first day of week (6).
As per example, the first row gets hidden/removed.

I found out that, same issue exist on indian, "hi-hi" locale.

StackBlitz fork

https://stackblitz.com/edit/tempus-dominus-v6-simple-setup-ghennc?file=index.js

What operating system(s) are you seeing the problem on?

Windows, Linux

What browser(s) are you seeing the problem on?

Chrome

What version of are you using? You can find this information from the sample StackBlitz.

Latest, 6.2.10

What your browser's locale? You can find this information from the sample StackBlitz.

da-DK / en-gb

[Eonasdan]

This appears to be a bug in the logic that attempts to figure out what the first week should look like based on the startOfTheWeek. This isn't really a locale issue, since it does something similar with en-us.

According to MDN and CanIUse weekInfo isn't available on FF-based browsers, which unfortunately means I can't use that to "guess".

[Eonasdan]

Hi, please check this StackBlitz.

[tirolel]

Thank you, It looks great!

[Eonasdan]

This has been released