Cursor jitter when pressing a (append) command

[ddadon10]

Describe the bug
The cursor intermittently jitters/jumps when pressing a. The cursor seems to briefly moves to the wrong position before settling into the correct insert position. This does not occurs all the time, but enough to be distracting while typing.

To Reproduce
Steps to reproduce the behavior:

1. Open a new text file
2. Add some text (e.g: "The quick brown fox jumps over the lazy dog")
3. Put the cursor to a character (e.g: p)
4. Press a, if the issue does not appear, press a multiple time

Expected behavior
Smooth cursor movement to append position (like the i command)

Screen Recordings
Screen recording of the issue:

VsCodeVimACommandIssue.mov

Screen recording of the behavior with cursorSmoothCaretAnimation set to on:

VsCodeVimACommandIssueSmooth.mov

Environment:

• Extension (VsCodeVim) version: 1.30.1
• VSCode version: 1.104.1 (Stable), 1.105.0 (Insider)
• OS: macOS 15.7 (24G222)

Additional context

• cursorSmoothCaretAnimation masks the issue but unusable due to Allow disabling editor.cursorSmoothCaretAnimation in specific modes (particularly insert). #3265
• Setting "extensions.experimental.affinity": {"vscodevim.vim": 1} does not solve the issue
• The issue is also present on VS Code Web
• I tested with all other extensions disabled. Both on Vscode, Vscode Insider and Vscode Web

[gioele-bernardini]

Hi, I couldn’t reproduce the issue.
I’m currently on Ubuntu 24.04.2 LTS and VS Code version 1.104.3 (so a later version from yours).

I created a new file, added some text, and placed the cursor on a character as you described, but the issue didn’t occur.
Is the problem still present in the latest VS Code release? Could you provide some additional details?

[ddadon10]

Hi @gioele-bernardini,

Thank you for checking :)
The issue persist with VSCode 1.104.3. The problem may only appear on macOS then.
I don't know what additional details I could provide though.