Changing tab doesn't close popup opened via YCMHover - Therefore, YCMHover doesn't open popup if an open such popup was left in another tab.

Author: Aster89Created May 8, 2026Updated Jul 20, 2026

Issue Prelude

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I have read and understood YCM's CONTRIBUTING document.
I have read and understood YCM's CODE_OF_CONDUCT document.
I have read and understood YCM's README, especially the Frequently Asked Questions section.
I have searched YCM's issue tracker to find issues similar to the one I'm about to report and couldn't find an answer to my problem. (Example Google search.)
If filing a bug report, I have included the output of vim --version.
If filing a bug report, I have included the output of :YcmDebugInfo.
If filing a bug report, I have attached the contents of the logfiles using the :YcmToggleLogs command.
If filing a bug report, I have included which OS (including specific OS version) I am using.
If filing a bug report, I have included a minimal test case that reproduces my issue, using vim -Nu /path/to/YCM/vimrc_ycm_minimal, including what I expected to happen and what actually happened.
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Issue Details

Provide a clear description of the problem, including the following key questions:

What did you do?

vim -Nu /path/to/YCM/ycm_vimrc_minimal some-file.cpp
open the file in two separe tabs, e.g. Ctrl-wsCtrl-wT (or different files, it doesn't matter)
wait for the popup to come up on some identifier (or trigger it with a manual call to YCMHover)
gt twice
- you'll see the popup hasn't closed; this is the reason for what I observe next;
gt
- here there's no popup yet
repeat just step 3,
- no popup opens, because the one on the other tab is still open

What did you expect to happen?

That a popup closes when I change tab, just like it closes when I change window. This in turn means that step 6 above would result in the popup being opened.

What actually happened?

Read repro steps.

Diagnostic data

Output of `vim --version`

VIM - Vi IMproved 9.2 (2026 Feb 14, compiled May 07 2026 19:14:51)
Included patches: 1-450
Compiled by Arch Linux
Huge version with GTK3 GUI.  Features included (+) or not (-):
+acl                +cursorshape        +jumplist           +multi_byte         -sodium             +vertsplit
+arabic             +dialog_con_gui     +keymap             +multi_lang         +sound              +vim9script
+autocmd            +diff               +lambda             -mzscheme           +spell              +viminfo
+autochdir          +digraphs           +langmap            +netbeans_intg      +startuptime        +virtualedit
-autoservername     +dnd                +libcall            +num64              +statusline         +visual
+balloon_eval       -ebcdic             +linebreak          +packages           -sun_workshop       +visualextra
+balloon_eval_term  +emacs_tags         +lispindent         +path_extra         +syntax             +vreplace
+browse             +eval               +listcmds           +perl/dyn           +tabpanel           +wayland
++builtin_terms     +ex_extra           +localmap           +persistent_undo    +tag_binary         +wayland_clipboard
+byte_offset        +extra_search       +lua/dyn            +popupwin           -tag_old_static     +wildignore
+channel            -farsi              +menu               +postscript         -tag_any_white      +wildmenu
+cindent            +file_in_path       +mksession          +printer            +tcl/dyn            +windows
+clientserver       +find_in_path       +modify_fname       +profile            +termguicolors      +writebackup
+clipboard          +float              +mouse              -python             +terminal           +X11
+clipboard_provider +folding            +mouseshape         +python3/dyn        +terminfo           +xattr
+cmdline_compl      -footer             +mouse_dec          +quickfix           +termresponse       -xfontset
+cmdline_hist       +fork()             +mouse_gpm          +reltime            +textobjects        +xim
+cmdline_info       +gettext            -mouse_jsbterm      +rightleft          +textprop           -xpm
+comments           -hangul_input       +mouse_netterm      +ruby/dyn           +timers             +xsmp_interact
+conceal            +iconv              +mouse_sgr          +scrollbind         +title              +xterm_clipboard
+cryptv             +insert_expand      -mouse_sysmouse     +signs              +toolbar            -xterm_save
+cscope             +ipv6               +mouse_urxvt        +smartindent        +user_commands
+cursorbind         +job                +mouse_xterm        +socketserver       +vartabs
   system vimrc file: "/etc/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
 3rd user vimrc file: "~/.config/vim/vimrc"
      user exrc file: "$HOME/.exrc"
  system gvimrc file: "/etc/gvimrc"
    user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
3rd user gvimrc file: "~/.config/vim/gvimrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
    system menu file: "$VIMRUNTIME/menu.vim"
  fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0 -I/usr/include/clo
udproviders -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/glycin-2 -I/usr/include/at-spi2-atk/2.0 -I/usr/incl
ude/at-spi-2.0 -I/usr/include/atk-1.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/fribidi -I/usr/include/p
ixman-1 -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/gio-unix-2.0 -I/usr/include/glib-
2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/sysprof-6 -march=x86-64 -mtune=generi
c -O2 -pipe -fno-plt -fexceptions -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -fno-omit-frame-point
er -mno-omit-leaf-frame-pointer -g -ffile-prefix-map=/build/vim/src=/usr/src/debug/vim -flto=auto -D_REENTRANT -U_FORTIFY_SOURCE
-D_FORTIFY_SOURCE=1
Linking: gcc -Wl,-E -Wl,-rpath,/usr/lib/perl5/5.42/core_perl/CORE -Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,n
ow -Wl,-z,pack-relative-relocs -flto=auto -L/usr/local/lib -o vim -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lcairo-gobject -lgdk_pixbuf-2
.0 -latk-1.0 -lpango-1.0 -lcairo -lharfbuzz -lgio-2.0 -lgobject-2.0 -lglib-2.0 -lz -lSM -lICE -lXt -lX11 -lwayland-client -lm -lX
dmcp -lSM -lICE -lm -ltinfo -lnsl -lcanberra -lacl -lattr -lgpm -L/usr/lib -ltclstub8.6 -ldl -lz -lpthread -lm

Output of `YcmDebugInfo`

Printing YouCompleteMe debug information...
-- Resolve completions: Up front
-- Client logfile: /tmp/ycm_gktt3l0w.log
-- Server Python interpreter: /usr/bin/python3
-- Server Python version: 3.14.4
-- Server has Clang support compiled in: False
-- Clang version: None
-- Extra configuration file found and loaded
-- Extra configuration path: /home/enrico/.ycm_extra_conf.py
-- C-family completer debug information:
--   Clangd running
--   Clangd process ID: 1291718
--   Clangd executable: ['/home/enrico/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-heade
r-insertion-decorators=0', '-resource-dir=/home/enrico/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/21
.1.3', '-limit-results=500', '-log=verbose']
--   Clangd logfiles:
--     /tmp/clangd_stderrvk2slo3x.log
--   Clangd Server State: Initialized
--   Clangd Project Directory: /home/enrico
--   Clangd Open Workspaces: {'/home/enrico'}
--   Clangd Settings: {}
--   Clangd Compilation Command: ['clang-tool', '-x', 'c++', '-std=c++26', '-Wall', '-Wextra', '-Wattributes', '-Wconversion', '/
home/enrico/uffa.cpp']
-- Server running at: http://127.0.0.1:35185
-- Server process ID: 1291676
-- Server logfiles:
--   /tmp/ycmd_35185_stdout_12qasvpu.log
--   /tmp/ycmd_35185_stderr_gvfxfnv5.log
-- Semantic highlighting supported: True
-- Virtual text supported: True
-- Popup windows supported: True

Output of `YcmDiags`

Irrelevant. It can as well be empty.

Output of `git rev-parse HEAD` in YouCompleteMe installation directory

f8fbc1ddf440b0b34ac23bcd7b7d8d14a7fb80e6

Contents of YCM, ycmd and completion engine logfiles

I think this is not needed here. Let me know if I'm mistaken.

OS version, distribution, etc.

Up-to-date Arch.

Output of build/install commands

Irrelevant, I believe.

Source: ycm-core/YouCompleteMe

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