Remove duplicate timeline events from non-interactive mode following 0.0.342 release

[andyfeller]

Describe the bug

0.0.342 release appears to have a regression in the non-interactive mode timeline as some events are displayed twice:

›$ copilot -p "Open README.md and append a line. Include your tags." --allow-all-tools

I'll open the README.md file and append a line to it.● I'll open the README.md file and append a line to it.

✓ List directory . (9 files)

✓ Read README.md (8 lines)

✓ Edit README.md (+1)
   ╭──────────────────────────────────────────────────────────────────────────────────────────────╮
   │ 1   # copilot-cli-311                                                                        │
   │ 2   Simple repository for testing github/copilot-cli#311                                     │
   │ 3   This line was appended by GitHub Copilot CLI.                                            │
   │ 4 + Another line appended with tags: [INSTR-OK] [PATH-OK]                                    │
   ╰──────────────────────────────────────────────────────────────────────────────────────────────╯

Done. Appended a new line to README.md. [INSTR-OK] [PATH-OK]● Done. Appended a new line to README.md. [INSTR-OK] [PATH-OK]


Total usage est:       1 Premium request
Total duration (API):  16.2s
Total duration (wall): 18.2s
Total code changes:    1 lines added, 0 lines removed
Usage by model:
    claude-sonnet-4.5    0 input, 0 output, 0 cache read, 0 cache write (Est. 0 Premium requests)

Affected version

0.0.342

Steps to reproduce the behavior

gh repo clone andyfeller/copilot-cli-311
cd copilot-cli-311
copilot -p "Open README.md and append a line. Include your tags." --allow-all-tools

Expected behavior

Timeline event information does not appear before the timeline circle

Additional context

• MacOS
• Mac Terminal
• Zsh

[andyfeller]

Closing this for now due to reproducibility issues, will continue to monitor and reopen as necessary.

[andyfeller]

Reopening as this problem still persists:

$ cat << EOF | copilot --screen-reader --allow-all-tools --allow-all-paths
I would like you to generate a story about a whale and write it to "whale-story.txt".  This story should be 20 lines long with each line ranging from 300 to 1000 characters
EOF

I'll create a 20-line whale story for you, with each line between 300-1000 characters.● I'll create a 20-line whale story for you, with each line between 300-1000 characters.

✓ Create whale-story.txt (+21)

I've created a 20-line whale story in "whale-story.txt". The story follows Aria, a humpback whale, through her life journey from birth through encounters with danger, finding love with Echo, raising their daughter Luna, and ultimately discovering connection with human researchers while maintaining her role as keeper of whale songs and ocean wisdom.● I've created a 20-line whale story in "whale-story.txt". The story follows Aria, a humpback 
   whale, through her life journey from birth through encounters with danger, finding love with 
   Echo, raising their daughter Luna, and ultimately discovering connection with human researchers 
   while maintaining her role as keeper of whale songs and ocean wisdom.


Total usage est:       2 Premium requests
Total duration (API):  1m 52.5s
Total duration (wall): 1m 54.3s
Total code changes:    21 lines added, 0 lines removed
Usage by model:
    unknown              0 input, 36.4k output, 0 cache read, 0 cache write (Est. 2 Premium requests)

I'm unsure if this duplication is being caused by streaming output or what but it makes the -p experience confusing and hard to read.

[andyfeller]

Closing this out as this appears to be address by @SteveSandersonMS in 0.0.348 streaming work! 🫶