Missing sort arrows in Pivot Tables

A clear and concise description of what the bug is.

Expected results

In pivot tables, there is a place where sort icons are displayed. Used to work fine with 0.36 and before.

Actual results

In v 0.37.2 in my case, a blank square appears.

Screenshots

I obfuscated data, you’ll see the issue anyway :

In 0.36.0 :

in 0.37.2 :

Here is a more complete view with we developer console open, missing icon selected. I compared oth workig and non working : they display the same thing.

How to reproduce the bug

Visualize any pivot table

Environment

(please complete the following information):

• superset version: superset version

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Superset 0.37.2
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• python version: python --version

Python 3.6.12

• node.js version: node -v

v12.16.3

• npm version: npm -v

6.14.4

Built using this Dockerfile : https://github.com/amancevice/docker-superset/blob/main/Dockerfile

Checklist

Make sure these boxes are checked before submitting your issue - thank you!

• [X ] I have checked the superset logs for python stacktraces and included it here as text if there are any.
• [X ] I have reproduced the issue with at least the latest released version of superset.
• [X ] I have checked the issue tracker for the same issue and I haven’t found one similar.

Additional context

Add any other context about the problem here.

Nothing appear in browser “web console”, no missing resources or warnings.

I would have bet on a missing resource file or font or something but no clue as to what I’m looking for.

[junlincc]

confirmed this is working properly now!

[squalou]

out of pure curiosity (so, feel free not to answer) : the glyphicons are back in this viz, and will be removed and replaced someday later ? (I remember seeing a discussion about removing glyphicons altogether).