Linters not working continuously while editing JSON/Python files

[muammereroglu]

Bug Description:

In Blueprint 1.37 or Theia 1.37 - 1.38, for JSON or Python files, linting does not work continuously while editing; they perform just after opening the file and stop. During editing, linters do not refresh and scan the file again; thus if there is a new error it does not show up, or if an error is corrected it stays at the editor and problems pane.

Steps to Reproduce:

1. Open Blueprint 1.37
2. Create a JSON file. Enter some random data with errors, eg.
   { "key1": "val1", "key2": val2_no_quotes, "key3": "val3_no_comma" "key4": "val4" }
3. No errors are detected. Close and reopen the file, errors will be visible.
4. Fix some errors, they will not disappear.

Additional Information

• Operating System: Linux
• Theia Version: 1.37, 1.38
• This problem is not present in Blueprint 1.36.
• Demo app at theia-cloud.io has the same problem for JSON and JS files. However, linter for Java files was working correctly.

[msujew]

@muammereroglu Can you see whether you get the same error in the console as #12499? If so, see #12527 for a resolution.

[muammereroglu]

@msujew After downgrading msgpackr, the issue is resolved. The responsiveness of the editor was also a bit slow compared to previous versions; it also reverted back to normal after this solution.