256-color support

[EncryptedCurse]

Versions

• ConEmu build: 190331 (x64)
• OS: Windows 10 (x64)
• Shell: Cygwin (SSH)

Problem description

Using Cygwin's bash (through ConEmu's connector) as the task, I am logging into a remote server over SSH. As shown here, printing all 256 colors does not work under regular conditions:

However, once I launch tmux and run the same script, it works just fine:

The script that I am using can be found here: https://gist.githubusercontent.com/hSATAC/1095100/raw/ee5b4d79aee151248bdafa8b8412497a5a688d42/256color.pl

Any idea as to why this is happening? Is this typical behavior? Do all the colors only work because tmux technically disables scrollback?

Steps to reproduce

1. Execute 256color.pl regularly—the colors don't work.
2. Open tmux and execute 256color.pl again—the colors now work.

[Maximus5]

https://conemu.github.io/en/Xterm256Colors.html#xterm_256_color_mode_requirements

[Maximus5]

gh-227