SO/SI character display issue in fixed-format RPG IV source files

[koinumasaoko]

Hello, thank you for the great work on Code for IBM i!
We’ve encountered a display issue when editing fixed-format RPG IV source members (SRCPF) that contain Japanese hardcoded strings. Specifically, when the source includes Shift-Out (SO) and Shift-In (SI) control characters, the text alignment becomes distorted in VS Code.
This misalignment affects the readability and accuracy of editing, especially in fixed-format RPG where column positions are critical. The issue does not occur in RDi or SEU, where SO/SI characters are handled correctly.
Would it be possible to improve the rendering of these control characters in the editor, or provide a workaround (e.g., font or encoding settings) to mitigate the issue?
Thank you again for your support and contributions to the IBM i community!