Why only show ASCII characters in preview, not all UTF-8?

[rustyhu]

When previewing text files, I noticed that non-ASCII Unicode characters (such as emoji or languages other than English) are not displayed, only ASCII is shown. Looking at the code, it seems the preview logic previously used a function to filter out non-ASCII characters.

walk/main.go

Line 910 in c78d211

previewContent := leaveOnlyAscii(content)

I have many files contain UTF-8 characters. I have tried to edit this code to show all UTF-8, then in my simple tests all preview of UTF-8 content look good. Maybe my tests are limited.

Is there a specific reason for this design? Thanks for your explanation!