When the pum preview is opened, the already opened help file window is closed.

[Hot-Ori]

Warning: I will close the issue without the minimal init.vim and the reproduction instructions.

Problems summary

If a candidate containing preview information is selected while the help file is open in another window, the help file window is closed as soon as the pum previewer is displayed. This only occurs in Vim and not in Neovim.

Expected

The help file window is not closed and remains open.

Environment Information (Required!)

• pum.vim version(SHA1): b2ca20d

• OS: Windows 11 Pro 23H2

• neovim/Vim :version output:

  VIM - Vi IMproved 9.1 (2024 Jan 02, compiled Oct 10 2024 22:18:22)
  MS-Windows 64 ビット GUI/コンソール 版 with OLE サポート
  適用済パッチ: 1-774
  Compiled by appveyor@APPVEYOR-VM
  Huge 版 with GUI.  機能の一覧 有効(+)/無効(-)
  +acl                +ex_extra           +mzscheme/dyn       -tcl
  +arabic             +extra_search       +netbeans_intg      +termguicolors
  +autocmd            -farsi              +num64              +terminal
  +autochdir          +file_in_path       +ole                -termresponse
  +autoservername     +find_in_path       +packages           +textobjects
  +balloon_eval       +float              +path_extra         +textprop
  +balloon_eval_term  +folding            +perl/dyn           -tgetent
  +browse             -footer             +persistent_undo    +timers
  ++builtin_terms     +gettext/dyn        +popupwin           +title
  +byte_offset        -hangul_input       -postscript         +toolbar
  +channel            +iconv/dyn          +printer            +user_commands
  +cindent            +insert_expand      +profile            +vartabs
  +clientserver       +ipv6               +python/dyn         +vertsplit
  +clipboard          +job                +python3/dyn-stable +vim9script
  +cmdline_compl      +jumplist           +quickfix           +viminfo
  +cmdline_hist       +keymap             +reltime            +virtualedit
  +cmdline_info       +lambda             +rightleft          +visual
  +comments           +langmap            +ruby/dyn           +visualextra
  +conceal            +libcall            +scrollbind         +vreplace
  +cryptv             +linebreak          +signs              +vtp
  +cscope             +lispindent         +smartindent        +wildignore
  +cursorbind         +listcmds           +sodium/dyn         +wildmenu
  +cursorshape        +localmap           +sound              +windows
  +dialog_con_gui     +lua/dyn            +spell              +writebackup
  +diff               +menu               +startuptime        -xattr
  +digraphs           +mksession          +statusline         -xfontset
  +directx            +modify_fname       -sun_workshop       -xim
  -dnd                +mouse              +syntax             +xpm_w32
  -ebcdic             +mouseshape         +tag_binary         -xterm_save
  +emacs_tags         +multi_byte_ime/dyn -tag_old_static
  +eval               +multi_lang         -tag_any_white
    システム vimrc: "$VIM\vimrc"
    ユーザー vimrc: "$HOME\_vimrc"
  第2ユーザー vimrc: "$HOME\vimfiles\vimrc"
  第3ユーザー vimrc: "$VIM\_vimrc"
     ユーザー exrc: "$HOME\_exrc"
  第2ユーザー exrc: "$VIM\_exrc"
   システム gvimrc: "$VIM\gvimrc"
   ユーザー gvimrc: "$HOME\_gvimrc"
  第2ユーザー gvimrc: "$HOME\vimfiles\gvimrc"
  第3ユーザー gvimrc: "$VIM\_gvimrc"
  デフォルトファイル: "$VIMRUNTIME\defaults.vim"
  システムメニュー: "$VIMRUNTIME\menu.vim"
  コンパイル: cl -c /W3 /GF /nologo -I. -Iproto -DHAVE_PATHDEF -DWIN32 -DHAVE_STDINT_H  -DFEAT_CSCOPE -DFEAT_TERMINAL -DFEAT_SOUND -DFEAT_NETBEANS_INTG   -DFEAT_XPM_W32 -DHAVE_SODIUM -DDYNAMIC_SODIUM -DDYNAMIC_SODIUM_DLL=\"libsodium.dll\" /I "C:\projects\vim-win32-installer\dependencies\libsodium\include" -DFEAT_JOB_CHANNEL -DFEAT_IPV6 -DHAVE_INET_NTOP -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 /source-charset:utf-8 /MP /Ox /GL -DNDEBUG /Zl /MT -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE -DVIMDLL -DFEAT_OLE -DFEAT_MBYTE_IME -DDYNAMIC_IME -DFEAT_GUI_MSWIN -DFEAT_DIRECTX -DDYNAMIC_DIRECTX -DFEAT_DIRECTX_COLOR_EMOJI -DDYNAMIC_ICONV -DDYNAMIC_GETTEXT -DFEAT_LUA -DDYNAMIC_LUA -DDYNAMIC_LUA_DLL=\"lua54.dll\" -DFEAT_PYTHON -DDYNAMIC_PYTHON -DDYNAMIC_PYTHON_DLL=\"python27.dll\" -DFEAT_PYTHON3 -DDYNAMIC_PYTHON3 -DDYNAMIC_PYTHON3_DLL=\"python3.dll\" -DDYNAMIC_PYTHON3_STABLE_ABI -DFEAT_MZSCHEME -I "C:\projects\vim-win32-installer\dependencies\racket\include" -DMZ_PRECISE_GC -DDYNAMIC_MZSCHEME -DDYNAMIC_MZSCH_DLL=\"libracket3m_dcgt6o.dll\" -DDYNAMIC_MZGC_DLL=\"libracket3m_dcgt6o.dll\" -DFEAT_PERL -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DDYNAMIC_PERL -DDYNAMIC_PERL_DLL=\"perl532.dll\" -DFEAT_RUBY -DDYNAMIC_RUBY -DDYNAMIC_RUBY_DLL=\"x64-ucrt-ruby320.dll\" -DRUBY_VERSION=32 -DFEAT_HUGE /Fd.\ObjDXOULYHRZAMD64/ /Zi
  リンク: link /nologo /opt:ref /LTCG /HIGHENTROPYVA:NO oldnames.lib kernel32.lib advapi32.lib shell32.lib gdi32.lib  comdlg32.lib ole32.lib netapi32.lib uuid.lib user32.lib  /machine:AMD64 version.lib  winspool.lib comctl32.lib libcmt.lib oleaut32.lib  /nodefaultlib:lua54.lib  /STACK:8388608  /nodefaultlib:python27.lib  /nodefaultlib:python3.lib   winmm.lib  Ws2_32.lib xpm\x64\lib-vc14\libXpm.lib  /PDB:vim64.pdb -debug

Provide a minimal init.vim/vimrc without plugin managers (Required!)

syntax enable
set nocompatible
filetype plugin indent on

set runtimepath^=~/vimfiles/plugged/pum.vim
set runtimepath+=~/vimfiles/plugged/denops.vim
set runtimepath+=~/vimfiles/plugged/ddc.vim
set runtimepath+=~/vimfiles/plugged/ddc-sorter_rank
set runtimepath+=~/vimfiles/plugged/ddc-matcher_head
set runtimepath+=~/vimfiles/plugged/neco-vim
set runtimepath+=~/vimfiles/plugged/ddc-ui-pum

call ddc#custom#patch_global('sources', ['necovim'])
call ddc#custom#patch_global('sourceOptions', {
            \ '_': {'matchers': ['matcher_head'], 'sorters': ['sorter_rank'], 'preview': v:true},
            \ })

call ddc#custom#patch_global('ui', 'pum')
call ddc#custom#patch_global('autoCompleteEvents', ['InsertEnter', 'TextChangedI', 'TextChangedP'])

call pum#set_option('preview', v:true)

inoremap <C-n>  <Cmd>call pum#map#select_relative(+1)<CR>
inoremap <C-p>  <Cmd>call pum#map#select_relative(-1)<CR>
inoremap <C-y>  <Cmd>call pum#map#confirm()<CR>
inoremap <C-e>  <Cmd>call pum#map#cancel()<CR>

call ddc#enable()

How to reproduce the problem from neovim/Vim startup (Required!)

1. start vim
2. open a help file window :h
3. edit a file in another window and select a ddc candidate containing preview info (e. g. a builtin function candidate in necovim source) in insert mode.

Screen shot (if possible)

https://github.com/user-attachments/assets/d91015cb-850d-442a-9126-6927ce3f4374

Upload the log messages by :redir and :message (if errored)

[Shougo]

Sorry. This is feature. :help does not work in popup wndow. So pum.vim need to execute dummy :help command. It breaks current help window.

[Shougo]

I have fixed the problem.