[Bug]: `key_down` signals no longer include a usable `char` field with ANSI control characters

[Ocawesome101]

Description

In 1.12.2 and older versions, pressing any combination of ctrl + a letter (e.g. ^A) sends the corresponding ANSI control character in the char field of the resulting key_down signal. For example, ^D sends 4. The 1.21.1 port no longer has this behavior, which breaks existing programs (ULOS2's VT100 emulator, for example).

Versions

• Minecraft version: 1.21.1
• NeoForge version: 21.1.248
• OpenComputers version: dafb46e
• Java version: 21.0.7

Environment

• Operating system: Linux
• Single-player or server: Single-player
• Other mods installed: None

Steps to reproduce

1. Boot OpenOS and run dmesg.
2. Press ctrl-D.
3. Observe that in 1.12.2, the fourth field is 4, while in 1.21.1, it is 0.

Expected behavior

This should be consistent across Minecraft versions.

Actual behavior

The char field is 0 for these events

[RobertCochran]

It seems like this might be an upstream bug? Unclear to me. I don't know why this would suddenly stop working unless something changed in GLFW or LWJGL.

[Ocawesome101]

I believe it's a change from LWJGL2 to LWJGL3. See MightyPirates#3572 and KosmosPrime#1.