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Vertical gap between braille characters #4499

Description

@lcheylus

Describe the bug
I'm using btop tool https://github.com/aristocratos/btop/ to monitor my Linux system. This tool is a "modern" version of top/htop to display CPU, memory, processes, disk usage with graphic representation in terminal.

btop uses some graphic characters to print graphs (see code in https://github.com/aristocratos/btop/blob/main/src/btop_draw.cpp).

I have some difference with graphics using Kitty terminal and other VTE terminal (Terminator).

Screenshots
btop screenshot with Kitty 0.24.1
Screenshot_Kitty

btop screenshot with Terminator 2.1.1
Screenshot_Terminator

Environment details
Linux Debian testing (bookworm) on amd64.

Kitty config (partial)
kitty 0.24.1 created by Kovid Goyal
Linux echoes 5.15.0-2-amd64 #1 SMP Debian 5.15.5-2 (2021-12-18) x86_64
Debian GNU/Linux bookworm/sid echoes /dev/tty

Running under:X11
Frozen: False
Paths:
  kitty: /usr/bin/kitty
  base dir: /usr/lib/kitty
  extensions dir: /usr/lib/kitty/kitty
  system shell: /bin/bash
Loaded config files:
  /etc/xdg/kitty/kitty.conf
  /home/fox/.config/kitty/kitty.conf

Config options different from defaults:
cursor_blink_interval 0.0
disable_ligatures     2
enable_audio_bell     False
enabled_layouts       ['splits:split_axis=horizontal']
font_family           DejaVuSansMono Nerd Font Mono
font_size             9.0
update_check_interval 0.0

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