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This is the default border, it looks ugly

default border

This is fzf preview window, how I can replace the popup border as fzf's ?

fzf border


Update: thank @ralf ! it works !

I replace it with...

Rounded:

['─', '│', '─', '│', '╭', '╮', '╯', '╰'],

Sharp:

['─', '│', '─', '│', '┌', '┐', '┘', '└'],

fzf style

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The border depends on 'encoding' and 'ambiwidth'. From the docs:

By default a double line is used all around when 'encoding' is "utf-8" and 'ambiwidth' is "single", otherwise ASCII characters are used.

In your case ASCII characters are used.

If you programmed the popup yourself, see :h popup and search for borderchars.

BTW: I don't think that fzf is using Vim popup.

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  • IIRC fzf spins up a terminal (in or out of vim) when invoked via its vim plugin. – D. Ben Knoble May 27 '20 at 18:28
  • To be precise, fzf uses a terminal, except in Terminal Vim with the default layout (:h fzf-inside-terminal-buffer). – Biggybi May 28 '20 at 14:21

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