Recognize supplementary characters

[tats-u]

Fixes #860

[tats-u]

I ran Unit Test in my VS 2026 with .NET 6/8/9 locally and all test cases succeeded.
Sorry for having submitted the half-baked PR.

[xoofx]

Thanks for the work! LGTM. Quite heavy with the Rune polyfill but we don't have much choices.

@MihaZupan anything other feedback?

[tats-u]

Rune is based on the latest snapshot of https://source.dot.net/#System.Private.CoreLib/src/libraries/System.Private.CoreLib/src/System/Text/Rune.cs,a0cdde85f676b935.

[tats-u]

If we adopt C# 14, we can use Extension Members instead of creating the UnicodeUtilitySupplement class.

[MihaZupan]

If we adopt C# 14, we can use Extension Members instead of creating the UnicodeUtilitySupplement class.

Could you get by with making the existing UnicodeUtlity file partial instead?

[tats-u]

Could you get by with making the existing UnicodeUtlity file partial instead?

I moved the new members to the existing UnicodeUtility.cs. Should UnicodeUtility.cs also exist in the Polyfills directory with partial added to both class definitions?

[MihaZupan]

Should UnicodeUtility.cs also exist in the Polyfills directory with partial added to both class definitions?

I don't think it's needed

[tats-u]

I see. Let me know if we should move it from Helpers to the Polyfills directory.

[tats-u]

@MihaZupan I have finished correcting all sections where your additional responses were not required.

[MihaZupan]

Thank you

[tats-u]

After accepting your suggestions, some tests now fail.

[tats-u]

I managed to get all tests passed again.

[tats-u]

Is this covered by https://github.com/xoofx/markdig/pull/913/changes#diff-e66da161369de25c14420f6b83bc176a4b7240b03cee5f9478e67335faa6d0a7R243? (the above if (start >= End))

[tats-u]

I will need to merge master and fix the workflow.

[tats-u]

I hope the new workflow works.

[tats-u]

@MihaZupan I did all what I have to do now. Please let me know if I still have ones. The ball is in your court now. You can directly push commits here if necessary.

[MihaZupan]

I opened a PR against your fork with some cleanup tats-u#1

[tats-u]

@MihaZupan Couldn't you directly push to my branch?

[MihaZupan]

Sure, but for the most part I try not to do that to avoid breaking contributors' workflows by messing up their branch. Pressing merge on the PR in your repo has the same effect.

[tats-u]

Pressing merge on the PR in your repo has the same effect.

• "Create a merge commit" → an extra commit will be added
• "Squash and merge", "Rebase and merge" → the commit history is not compatible with your branch MihaZupan:rune-feedback

From now on, please feel free to add commits as needed, then just press “Squash and merge” at the end (all messy commits will be aggregated into a single commit).

[tats-u]

Thank you for your approval.

[xoofx]

Thank you for your approval.

Thank for your work! I will do a release later tonight.