Tag structure manager and viewer with CSS classes for easy styling

[edan-bainglass]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.41%. Comparing base (7353264) to head (056fc4f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #662      +/-   ##
==========================================
+ Coverage   83.39%   83.41%   +0.01%     
==========================================
  Files          17       17              
  Lines        3578     3581       +3     
==========================================
+ Hits         2984     2987       +3     
  Misses        594      594              

Flag	Coverage Δ
python-3.11	83.41% <100.00%> (+0.01%)	⬆️
python-3.9	83.44% <100.00%> (+0.01%)	⬆️

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[superstar54]

The class is added but not used. So, is it necessary to add the class (hard-coded) here? The developer can add their class when using the widgets, right?

[edan-bainglass]

The class is added but not used. So, is it necessary to add the class (hard-coded) here? The developer can add their class when using the widgets, right?

Sure. But this way, they don't have to. We provide the widget with the class, so developers can just add styles in their stylesheets. Otherwise, let's say they use the structure manager in multiple places (as we do in aiidalab-qe), they'll have to tag each instance. Not ideal. Hence this PR.

[superstar54]

Thanks for the explanation. LGTM!