Dataframe viewer cannot show "_" in column names

[mIgLLL]

Issue Report Checklist

• Searched the issues page for similar reports
• Read the relevant sections of the Spyder Troubleshooting Guide and followed its advice
• Reproduced the issue after updating with conda update spyder (or pip, if not using Anaconda)
• Could not reproduce inside jupyter qtconsole (if console-related)
• Tried basic troubleshooting (if a bug/error)
  • Restarted Spyder
  • Reset preferences with spyder --reset
  • Reinstalled the latest version of Anaconda
  • Tried the other applicable steps from the Troubleshooting Guide
• Completed the Problem Description, Steps to Reproduce and Version sections below

Problem Description

When a variable name with "_", such as "a_a", you can just see "a a" in the column rather than "a_a"

What steps reproduce the problem?

1. import pandas as pd
2. a=pd.DataFrame()
3. a['a_a']=1
4. Open the variable explorer and check the column name of "a_a"

What is the expected output? What do you see instead?

See the "a_a" instead.

Paste Traceback/Error Below (if applicable)

PASTE TRACEBACK HERE

Versions

• Spyder version: 4.2.3 （since 4.1.x , I forgot when, and it still happends in 5.0.0）
• Python version: 3.8.8
• Qt version:
• PyQt version:
• Operating System name/version:

Dependencies

PASTE DEPENDENCIES HERE

[ccordoba12]

Hey @mIgLLL, thanks for reporting. We'll take a look at it for our next version.