[Bug]: vscode-neovim cursor jumps to first row after entering a directory with preview open

[corwinm]

Reproduction

1. Install and enable vscode-neovim.
2. Open an oil buffer.
3. Open preview for the selected entry.
4. Enter a directory from the oil buffer.
5. Press j using vscode-neovim to move down one row.

Actual behavior

The cursor jumps/snaps back to the first row instead of staying on the newly selected row.

Expected behavior

The cursor should move down one row normally.

Scope / current findings

• Reproduces with vscode-neovim.
• Does not reproduce with arrow keys.
• Does not reproduce with VSCodeVim.
• This appears to be pre-existing rather than caused by the recent previewByDefault work.
• The issue is specifically tied to oil buffers with preview enabled after directory navigation.

Notes from investigation

• We removed a delayed cursor reset in src/commands/select.ts on the "enter directory" path because it could race with real user movement.
• We also fixed src/decorations.ts so hidden-prefix correction no longer forces the cursor to line 0.
• After those fixes, the general extension tests pass and normal VS Code / VSCodeVim movement behave correctly.
• The remaining bad behavior looks specific to the timing/order of selection updates coming from vscode-neovim.

Likely areas to revisit

• src/decorations.ts
  • hidden prefix correction in onDidChangeTextEditorSelection
  • any cursor mutation during decoration updates
• src/commands/select.ts
  • post-navigation cursor placement when entering directories
• possible interaction with vscode-neovim cursor synchronization timing

Environment observed during investigation

• branch: feat/file-preview-by-default
• commit: db4330e3c08da76d909368690134ea03b81df17a
• oil.code workspace tests were passing at the time of filing

Follow-up

When revisiting this, it would be useful to capture the exact sequence of VS Code selection events vs vscode-neovim cursor updates while moving from row 0 to row 1 in a freshly opened oil directory buffer with preview enabled.