Allow to start list index from 0

[FilipTokarski]

📝 Provide a description of the improvement

Currently when setting list start index, you cannot go below value 1. However, some use cases require starting list numbering from value 0.

It would be good to enhance this feature and allow starting lists from 0.

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[mlewand]

@FilipTokarski can you provide what are those use cases that require 0 start?

[Reinmar]

I checked Google Docs too. Negative numbers are not allowed, but 0 is. 

I don't think it requires more analysis. It's a simple and safe change.

[Reinmar]

Scope:

• We've got one UI for both types of lists (List and DocumentList). So this change need to be made in two of them.
• One potential issue is that 0 might be treated as a falsy value at some point during a conversion.

[108signals]

@mlewand @FilipTokarski we had the same question for our customer. Here's the use case: an organization has a budget request starting with #1 that goes through a long budget process where each list item is significant and now referred to by their number. Near the end an additional item that conceptually belongs before #1 is identified and also approved by budget. Yes an edge case but good to hear this is a simple and safe change.