🐛: Anchor ids in separate renders should not affect each other.

[distractedmosfet]

The anchors plugin remembered used anchor ids per MarkdownIt object for entire lifetime of the object. This means if you use the same MarkdownIt object to render multiple documents then the generated anchor ids will be affected by the order of rendered documents.

This PR makes it clear the known ids after anchors are generated, so separate renders should not affect each other.

This seems like a safe fix to my eyes but I haven't examined these systems in-depth. It does past the single anchors test still.

[welcome]

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[distractedmosfet]

Also I apologize for not including the emoji in the first commit, my brain just skipped over it like it wasn't there. You lot have a system going on! I'm coming in here and messing it up.

[codecov]

Codecov Report

Base: 93.19% // Head: 93.19% // No change to project coverage 👍

Coverage data is based on head (45bbb81) compared to base (855067e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   93.19%   93.19%           
=======================================
  Files          25       25           
  Lines        1351     1351           
=======================================
  Hits         1259     1259           
  Misses         92       92           

Flag	Coverage Δ
pytests	93.19% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mdit_py_plugins/anchors/index.py	100.00% <100.00%> (ø)

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[chrisjsewell]

Thanks, sorry for the delayed response!
Yeh I can't think why I put in there in the first place 🤔 but the fix seems to track with https://github.com/valeriangalliat/markdown-it-anchor/blob/8918e4eba26df9b13819acde5a9bf4e4fb8d9816/index.js#L37 👍

[welcome]

Congrats on your first merged pull request in this project! 🎉


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[distractedmosfet]

Thanks, sorry for the delayed response! Yeh I can't think why I put in there in the first place thinking but the fix seems to track with https://github.com/valeriangalliat/markdown-it-anchor/blob/8918e4eba26df9b13819acde5a9bf4e4fb8d9816/index.js#L37 +1

Sweet! No worries about the delay, just happy to have contributed back :)