Column menu spaces don't respect special characters (accents, emojis...)

[Jiogo18]

Platform Arch Linux
Terminal software Konsole with nushell

Completion results can be shifted when a file/folder contains accents or emojis in nushell.

Steps to reproduce

With reedline

1. Add the following commands in examples/completions.rs

        "file0a".into(),
        "file0b".into(),
        "file0é".into(),
        "file1a".into(),
        "file1é".into(),
        "file2a".into(),
        "file2éééééééé".into(),
        "file3a".into(),

2. Run cargo run --example completions
3. Type f[TAB]
4. The columns are missing spaces for results with accents

With nushell

1. touch file0a file0b file0é file1a file1📁 file2a file2📁📁📁📁📁 file3a
2. ./[TAB] (if it doesn't work, use ls [TAB] or similar)
3. Same result

Screenshots/Screencaptures

Additional context

Changing .len() to .width() fix this

reedline/src/menu/columnar_menu.rs

Line 657 in a580ea5

let empty_space = self.get_width().saturating_sub(suggestion.value.len());

Other .len() call could be replaced by .width() in this file:

• longest_suggestion
• shortest_base_string (in case all the results contains lots of special characters)
• maybe marker