Codex CLI in an Eclipse IDE terminal doesn't allow backward scrolling (also with --no-alt-screen option)

Codex CLI in an Eclipse IDE terminal window doesn't allow backward scrolling. Also, running Codex with the --no-alt-screen option doesn't change anything.
I know the Eclipse terminal is scrollable and Codex CLI running in Windows cmd or powershell is scrollable.
So there must be some problem between Codex CLI and Eclipse terminal.

## Steps to reproduce

* Open a terminal in eclipse IDE
* Start Codex CLI with or without --no-alt-screen (even setting "set TERM=dumb" before calling codex doesn't help)
* Give Codex the following prompt : write 50 rows (a enter b enter c etc...)
* Try scrolling backward and see if it appears

## Tested under this environment:
* Windows Server 2019
* Eclipse IDE/Platform version Version: 2026-03 (4.39.0) Build id: 20260305-0817
* Codex Cli version 135

## Workarounds

1. Use the internal Codex transcript directrly in the Eclipse terminal running Codex TUI, activable with **Ctrl+T**
2. **Tricks Codex to think it's running inside Zwellij**:
For linux:
```
ZELLIJ=1 codex --no-alt-screen -c tui.raw_output_mode=true
```
For windows:
```
set ZELLIJ=1
codex --no-alt-screen -c tui.raw_output_mode=true
```