glyphs rendering issue

Describe the bug
If I disable the option 'Use Core Text Renderer" and I set a font size larger than h18 (e.g. h19), I get vertical bars after right separators (e.g. look on the right of the following image after "5%")

This is with Hack Nerd Font but note that I obtain this behavior with all fonts I have installed, i.e. FiraCode, Meslo, Hack Nerd Font Mono, JetBeans, JetBeans Mono, etc.

To Reproduce
Detailed steps to reproduce the behavior:

1. Install the "lightline" plugin (see https://github.com/itchyny/lightline.vim)
2. Install the "Hack Nerd Font" (see https://github.com/ryanoasis/nerd-fonts)
3. Add following settings to your .vimrc:

let g:lightline = {
      \ 'separator': { 'left': '_LS_', 'right': '_RS_' },
      \ 'colorscheme': 'deus',
      \ 'active': {
      \   'left': [ [ 'mode', 'paste' ],
      \             [ 'relativepath', 'extraflags', 'gitstat'] ],
      \   'right': [ [ 'lineinfo' ],
      \              [ 'percent' ],
      \              [ 'fileformat', 'fileencoding', 'filetype' ], 
      \              [ 'linter_checking', 'linter_errors', 'linter_warnings', 'linter_ok' ] 
      \            ]
      \ },
      \ }  

where LS and RS are left and right triangular separators as shown in the above
image which I uploaded

Environment (please complete the following information):

• Vim version:

VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Apr 12 2020 00:47:07)
macOS version
Included patches: 1-539
Compiled by travis@Traviss-Mac.local
Huge version with MacVim GUI.  Features included (+) or not (-):
+acl               +comments          +find_in_path      +lispindent        +multi_byte        +reltime           +terminal          +wildignore
+arabic            +conceal           +float             +listcmds          +multi_lang        +rightleft         +terminfo          +wildmenu
+autocmd           +cryptv            +folding           +localmap          -mzscheme          +ruby/dyn          +termresponse      +windows
+autochdir         +cscope            -footer            +lua/dyn           +netbeans_intg     +scrollbind        +textobjects       +writebackup
-autoservername    +cursorbind        +fork()            +menu              +num64             +signs             +textprop          -X11
+balloon_eval      +cursorshape       +fullscreen        +mksession         +odbeditor         +smartindent       +timers            -xfontset
+balloon_eval_term +dialog_con_gui    -gettext           +modify_fname      +packages          -sound             +title             +xim
+browse            +diff              -hangul_input      +mouse             +path_extra        +spell             +toolbar           -xpm
++builtin_terms    +digraphs          +iconv             +mouseshape        +perl/dyn          +startuptime       +transparency      -xsmp
+byte_offset       +dnd               +insert_expand     +mouse_dec         +persistent_undo   +statusline        +user_commands     -xterm_clipboard
+channel           -ebcdic            +job               -mouse_gpm         +popupwin          -sun_workshop      +vartabs           -xterm_save
+cindent           +emacs_tags        +jumplist          -mouse_jsbterm     +postscript        +syntax            +vertsplit
+clientserver      +eval              +keymap            +mouse_netterm     +printer           +tag_binary        +virtualedit
+clipboard         +ex_extra          +lambda            +mouse_sgr         +profile           -tag_old_static    +visual
+cmdline_compl     +extra_search      +langmap           -mouse_sysmouse    +python/dyn        -tag_any_white     +visualextra
+cmdline_hist      -farsi             +libcall           +mouse_urxvt       +python3/dyn       -tcl               +viminfo
+cmdline_info      +file_in_path      +linebreak         +mouse_xterm       +quickfix          +termguicolors     +vreplace
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
  system gvimrc file: "$VIM/gvimrc"
    user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
    system menu file: "$VIMRUNTIME/menu.vim"
  fall-back for $VIM: "/Applications/MacVim.app/Contents/Resources/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_MACVIM -Wall -Wno-unknown-pragmas -pipe  -DMACOS_X -DMACOS_X_DARWIN  -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_
SOURCE=1
Linking: clang   -L. -fstack-protector-strong -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl@1.1/lib -L/usr/local/opt/readline/lib -L. -fstack
-protector-strong -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl@1.1/lib -L/usr/local/opt/readline/lib  -L/usr/local/lib -o Vim -framework Coc
oa -framework Carbon       -lm  -lncurses -liconv -framework AppKit   -fstack-protector  -L/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE

• OS: Mac OSX Catalina 10.15.5
• Terminal: GUI

Bắt đầu bằng cách tái hiện vấn đề trong GUI của MacVim với Core Text Renderer bị vô hiệu hóa, cỡ phông chữ lớn hơn h18 và các cài đặt dấu phân cách của lightline được hiển thị trong issue. Theo dõi đường dẫn kết xuất glyph của GUI đối với các dấu phân cách bên phải; được xem là hoàn tất khi các dấu phân cách được kết xuất mà không có các thanh dọc trên tất cả các phông chữ và cấu hình được liệt kê.