New way to update folding regions (PR #13783) freezes Spyder

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

While using the editor, Spyder freeses for ~30s very often. I saw with the frame explorer that it was blocked in the new code intoduced by PR #13783. After reverting the merge, spyder works again.

What steps reproduce the problem?

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

Paste Traceback/Error Below (if applicable)

PASTE TRACEBACK HERE

Versions

• Spyder version:
• Python version:
• Qt version:
• PyQt version:
• Operating System name/version:

Dependencies

PASTE DEPENDENCIES HERE

[jnsebgosselin]

Ok, I will test it while I work. I can report back tomorrow. Thanks for working on this.

[ccordoba12]

Great! Thanks @jnsebgosselin for the confirmation!