Windows: Unreliable keyboard input - random keystrokes dropped during fast typing

[alejandroqh]

Description

When typing rapidly in terminal windows on Windows, random keystrokes are dropped/missed. The issue does not occur on macOS
or Linux.

Steps to Reproduce

1. Open a terminal window in term39 on Windows
2. Type a sequence rapidly at constant tempo, e.g., 12345678901234567890
3. Observe that random characters are missing

Expected Behavior

All keystrokes should be captured: 12345678901234567890

Actual Behavior

Random characters are dropped:

• 12467890123567890 (missing: 3, 5, 4)
• 124567901234567890 (missing: 3, 8)

The issue affects all characters, not just numbers.

Additional Observations

• For a brief moment, the cursor appears to jump outside the terminal window and then returns, as if something momentarily
  takes focus
• This behavior was not present in v0.13.0 - keyboard input was reliable
• Issue appeared after v0.13.0, possibly related to changes in event loop batch processing or key event filtering

Environment

• OS: Windows 10/11
• term39 version: v0.16.7
• Working version: v0.11.0 (not confirmed)

Potential Causes Investigated

1. Event loop batch processing (introduced post-v0.11.0)
2. KeyEventKind filtering change (!= Press → == Release)
3. Poll timeout values
4. PTY flush timing

[alejandroqh]

@graphixillusion has confirmed that still present in v0.17.0

[graphixillusion]

OK thanks for the info I will continue working, do you remember which version worked good for you?

Sadly the first version i've tried was the 0.16.x and the problem was already there....

[alejandroqh]

No problem, I’m running local in a VM with Win 11 and it worked for me. Can you give a try to the last release v0.17.2? Thanks.

[graphixillusion]

Nothing, still present. Oh, i'm seeing now that you are using the crossterm crate: these issues are 100% related to this crate as i already got the same problems in the past with other projects and i never find a solution for this...

[alejandroqh]

Hi @graphixillusion, I have not more reports, and I have tested in Windows and looks good, maybe is something related with your system as you mentions, are you ok I close this issue?

[graphixillusion]

Ok, i don't know why it's happening on my end then...

[alejandroqh]

@graphixillusion Thanks, we can continue the talking any way. If I found something by sure I will let you know.