Windows cmd: Typing brackets prepends a meta character #298

Description

What are your expected behavior and actual behavior of your environment?

When I type brackets on Windows with reline-0.2.6 an additional "^[" is prepended to each character. Typing "[{}]" into irb looks like so:

but it should look like in reline-0.2.5:

On a German keyboard the brackets "{[]}" are on "Alt-Right + 7" to "Alt-Right + 0". So one has to press Alt-Right, which types a "^[" on it's own - before the actual key 7 to 0 is pressed.

This issue was introduced by commit 06c1f45

Terminal Emulator

What's your terminal emulator?

Windows cmd