Pressing "Tab" several times causes Leaderf to Quite unexpectedly.

• vim or neovim?
  • vim
  • neovim
• Output of vim --version or nvim --version:

VIM - Vi IMproved 8.2 (2019 Dec 12, compiled Dec 22 2020 23:44:34)
macOS version
Included patches: 1-1719
Compiled by Homebrew
Huge version with MacVim GUI.  Features included (+) or not (-):
+acl               +file_in_path      -mouse_sysmouse    -tag_old_static
+arabic            +find_in_path      +mouse_urxvt       -tag_any_white
+autocmd           +float             +mouse_xterm       +tcl
+autochdir         +folding           +multi_byte        +termguicolors
-autoservername    -footer            +multi_lang        +terminal
+balloon_eval      +fork()            -mzscheme          +terminfo
+balloon_eval_term +fullscreen        +netbeans_intg     +termresponse
+browse            +gettext           +num64             +textobjects
++builtin_terms    -hangul_input      +odbeditor         +textprop
+byte_offset       +iconv             +packages          +timers
+channel           +insert_expand     +path_extra        +title
+cindent           +ipv6              +perl              +toolbar
+clientserver      +job               +persistent_undo   +transparency
+clipboard         +jumplist          +popupwin          +user_commands
+cmdline_compl     +keymap            +postscript        +vartabs
+cmdline_hist      +lambda            +printer           +vertsplit
+cmdline_info      +langmap           +profile           +virtualedit
+comments          +libcall           -python            +visual
+conceal           +linebreak         +python3           +visualextra
+cryptv            +lispindent        +quickfix          +viminfo
+cscope            +listcmds          +reltime           +vreplace
+cursorbind        +localmap          +rightleft         +wildignore
+cursorshape       +lua               +ruby              +wildmenu
+dialog_con_gui    +menu              +scrollbind        +windows
+diff              +mksession         +signs             +writebackup
+digraphs          +modify_fname      +smartindent       -X11
+dnd               +mouse             -sound             -xfontset
-ebcdic            +mouseshape        +spell             +xim
+emacs_tags        +mouse_dec         +startuptime       -xpm
+eval              -mouse_gpm         +statusline        -xsmp
+ex_extra          -mouse_jsbterm     -sun_workshop      -xterm_clipboard
+extra_search      +mouse_netterm     +syntax            -xterm_save
-farsi             +mouse_sgr         +tag_binary        

• Operating system:
  • Linux
  • Mac OS X
  • Windows
  • Etc.
• Configurations related to LeaderF in vimrc:

let g:Lf_WindowPosition = 'popup'
let g:Lf_PreviewInPopup = 1
let g:Lf_PopupPreviewPosition = 'bottom'
let g:Lf_PopupHeight = 0.6
let g:Lf_HideHelp = 1
let g:Lf_UseCache = 0
let g:Lf_ShowDevIcons = 0
let g:Lf_WildIgnore = { 'dir': [], 'file': ['z-*.go'] }
let g:Lf_DefaultExternalTool = 'find'

Describe your question, feature request, or bug.

The problem is that when I press Tab to go back and forth between command prompt and results window, LeaderF sometimes quits unexpectedly. Can be reproduce every single time, regardless of the speed at which I toggle between Normal and Insert mode of LeaderF.

Steps to reproduce

1. enter the command :LeaderF file --popup to open LeaderF popup window.
2. Repeatedly press Tab like 10 times. LeaderF quits.

Actual behaviour

LeaderF quits.

Expected behaviour

Should cycle between command prompt and results window without ever quitting.

[Yggdroot]

Confirmed, after I update vim to version 8.2.2100, the issue does not show up any more.

[Yggdroot]

This issue is caused by https://github.com/vim/vim/issues/7178 , please update your vim.