Tabs example has inconsistent tab spacing

[jamietanna]

Describe the bug

The example tabs does not render correctly.

Setup

Please complete the following information along with version numbers, if applicable.

• OS: Mac OS Tahoe (26.0)
• Shell: zsh
• Terminal Emulator: ghostty, Terminal.app
• Terminal Multiplexer: (seen happening in and out of tmux)

To Reproduce
Steps to reproduce the behavior:

1. Go to https://github.com/charmbracelet/bubbletea/blob/e5fb1b8ff58ea4fc17c48c91c800d48046336e26/examples/tabs/main.go
2. Run with go run .
3. Notice behaviour on tab spacing

Source Code

https://github.com/charmbracelet/bubbletea/blob/e5fb1b8ff58ea4fc17c48c91c800d48046336e26/examples/tabs/main.go

Expected behavior
Tabs are spaced correctly

Screenshots

Additional context

It seems likely that it's a "me" problem.

[jamietanna]

I've got Liberation Mono as the font in Ghostty, and Terminal.app is using the default, SF Mono Regular

[jamietanna]

I don't see this issue on my Linux machine

[techieadi4703]

I'm interested in this issue can you assign me this issue to me.
@jamietanna @rubysolo @twpayne @mattn @meowgorithm

[mattn]

What is your $LANG?

[jamietanna]

On both Mac (where this issue is) and Linux (where I don't see this issue) I see:

% echo $LANG
en_GB.UTF-8