Incorrect fallback font used for braille characters

Description :octocat:

Trying to render braille characters (like those used on one of the text banners) uses a 'incorrect' fallback font.

Running spacemacs without the GUI makes it render properly.

Also, I have another install of spacemacs where it renders properly and even copying the whole .emacs.d directory and .spacemacs did not resolve the issue.

My main font is set to the default one, Source Code pro

full config here

Reproduction guide :beetle:

Start Emacs

paste this into a buffer:

⠀⠀⠀⣀⣀⣀⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⢀⠎⠁⠀⠀⠈⠉⠒⠦⢀⡀⡄⡤⡤⡤⡤⡤⣄⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⡎⡠⠒⠉⠉⢑⢲⢀⠀⠀⠈⠪⢣⢫⡺⣹⡹⣝⠾⣻⣶⣤⡀⠀⠀⠀⠀⠀⠀
⠀⢿⡅⠀⠠⡰⡊⡎⡪⢊⠢⡠⢀⠀⠘⠜⣜⢎⡯⣳⠀⠳⣻⣿⣷⡄⠀⠀⠀⠀
⠀⢹⣇⡠⠫⡪⡊⡢⢊⠨⠨⡂⢕⢐⠄⡀⠈⢺⢸⣝⡆⠀⢻⣷⣿⣿⣦⡀⠀⠀
⠀⠈⣟⢪⢇⠀⠑⠌⠢⠡⡃⠢⡑⡐⢅⢇⢆⠀⠑⢕⣯⡀⠀⢿⣿⣿⣿⣷⡀⠀
⠀⣐⢵⢣⢻⣦⣀⠀⠀⠁⠈⠌⠢⡊⡜⡔⡕⡭⢆⠈⠺⡄⠀⠸⣿⣿⣿⣿⣧⠀    Welcome to
⠀⣵⡫⡮⡣⣿⣿⣿⣦⡀⠀⠀⠀⠀⠀⠈⠘⠘⠙⠑⠀⠀⠀⠀⢿⣿⣿⣿⣿⡀
⠀⣗⡯⣞⢵⢽⣿⣿⣿⣟⡕⡕⡤⡠⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢹⣿⣿⣿⣿⡆   [ S p a c e m a c s ]
⠀⣯⢿⣺⣝⢮⣿⣿⣿⣿⣿⡪⡮⣳⢝⡽⣲⢤⣄⡀⠀⠀⠀⠀⠈⣿⣿⣿⣿⠂
⠀⢸⣿⡽⣾⣳⣻⣿⣿⣿⣿⣾⡽⣺⢵⡯⣯⣿⣳⡿⣷⣦⣄⠀⠀⢿⣿⣿⡟⠀
⠀⠀⢺⣿⣯⣿⣽⣿⣿⣿⣿⣿⣿⣽⣯⣟⣿⣾⣿⣿⣿⣿⣿⣿⣶⣼⣿⡿⠁⠀
⠀⠀⠀⠻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡟⠁⠀⠀
⠀⠀⠀⠀⠘⠿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠋⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠉⠻⢿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡿⠟⠋⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠛⠻⠻⠿⠿⠿⠛⠛⠉⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀

Observed behaviour: :eyes: :broken_heart: The fallback font used for braille characters renders empty dots as smaller dots, also there's spacing between lines.

It looks like this:

Expected behaviour: :heart: :smile: It should render braille characters as dots whithout spaces between lines.

System Info :computer:

OS: gnu/linux
Emacs: 27.1
Spacemacs: 0.300.0
Spacemacs branch: develop (rev. 4f7246da0)
Graphic display: t
Distribution: spacemacs
Editing style: emacs
Completion: helm

Layers:

(systemd html javascript octave rust csv markdown yaml
     (python :variables python-indent 4 python-indent-offset 4 indent-tabs-mode t tab-width 4)
     lua helm auto-completion better-defaults emacs-lisp git org
     (shell :variables shell-default-height 30 shell-default-position 'bottom)
     spell-checking syntax-checking version-control treemacs multiple-cursors)

System configuration features: XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON PDUMPER LCMS2 GMP

Backtrace :paw_prints:

M-x describe-char

             position: 1990 of 1996 (100%), column: 0
            character: ⣯ (displayed as ⣯) (codepoint 10479, #o24357, #x28ef)
              charset: unicode (Unicode (ISO10646))
code point in charset: 0x28EF
               script: braille
               syntax: w    which means: word
             category: .:Base, L:Left-to-right (strong)
             to input: type "C-x 8 RET 28ef" or "C-x 8 RET BRAILLE PATTERN DOTS-1234678"
          buffer code: #xE2 #xA3 #xAF
            file code: not encodable by coding system undecided-unix
              display: by this font (glyph code)
    ftcrhb:-PfEd-Unifont-normal-normal-normal-*-22-*-*-*-d-0-iso10646-1 (#x28F2)

Character code properties: customize what to show
  name: BRAILLE PATTERN DOTS-1234678
  general-category: So (Symbol, Other)
  decomposition: (10479) ('⣯')

There is an overlay here:
 From 1990 to 1992
  face                 hl-line
  priority             -50
  window               #<window 3 on REPORT_SPACEMACS_ISSUE>

There are text properties here:
  fontified            t
  rear-nonsticky       t

[back]             position: 1990 of 1996 (100%), column: 0
            character: ⣯ (displayed as ⣯) (codepoint 10479, #o24357, #x28ef)
              charset: unicode (Unicode (ISO10646))
code point in charset: 0x28EF
               script: braille
               syntax: w    which means: word
             category: .:Base, L:Left-to-right (strong)
             to input: type "C-x 8 RET 28ef" or "C-x 8 RET BRAILLE PATTERN DOTS-1234678"
          buffer code: #xE2 #xA3 #xAF
            file code: not encodable by coding system undecided-unix
              display: by this font (glyph code)
    ftcrhb:-PfEd-Unifont-normal-normal-normal-*-22-*-*-*-d-0-iso10646-1 (#x28F2)

Character code properties: customize what to show
  name: BRAILLE PATTERN DOTS-1234678
  general-category: So (Symbol, Other)
  decomposition: (10479) ('⣯')

There is an overlay here:
 From 1990 to 1992
  face                 hl-line
  priority             -50
  window               #<window 3 on REPORT_SPACEMACS_ISSUE>

There are text properties here:
  fontified            t
  rear-nonsticky       t

For reference, it should look like this: (this is running on a console)

edit: setting the font for the 'unicode section to symbola seems to help, like so:

(set-fontset-font t 'unicode "Symbola")

syl20bnr / spacemacs