Version

1.53.0

Steps to reproduce

1. Download this playwright trace: example-trace.zip
2. Use playwright version 1.52 trace viewer to view the trace, e.g. playwright show-trace example-trace.zip
   • Observe that the trace correctly shows hidden_stuff in the collapsible group text:
     
3. Use playwright version 1.53.0 trace viewer to view the trace, e.g. playwright show-trace example-trace.zip
   • Observe that the trace does not correctly show hidden_stuff in the collapsible group text:
     

Expected behavior

Playwright trace viewer should show the collapsible group name exactly as given in the string passed to Tracing.group(name), even if it has unusual characters such as curly braces

E.g. as with version 1.52:

Actual behavior

Collapsible group names are sometimes mangled if the have unusual characters such as curly braces

E.g.:

Additional context

The following script was used to generate the attached example trace:

# /// script
# requires-python = ">=3.11"
# dependencies = [
#     "playwright~=1.52.0",
# ]
# ///

from pathlib import Path

from playwright.sync_api import sync_playwright


def main():
    with (
        sync_playwright() as pw,
        pw.chromium.launch(headless=False) as browser,
        browser.new_context() as browser_context,
        browser_context.new_page() as page,
    ):
        browser_context.tracing.start(snapshots=True, screenshots=True, sources=True)
        try:
            browser_context.tracing.group("This group has curly braces here --> {{ hidden_stuff }} <--")
            page.evaluate("console.log('hello world')")
            browser_context.tracing.group_end()
        finally:
            browser_context.tracing.stop(path=Path("example-trace.zip"))


if __name__ == "__main__":
    main()

NOTE: while the given trace was generated with playwright version 1.52.0, the issue also occurs for traces generated with 1.53.0

Environment

- Operating System: macOS 15.3.2
- CPU: arm64
- Browser: All
- Python Version: Any