Unable to copy text after copying text to unnamedplus in neovim under wayland

[ch4xer]

Describe the bug
After copy text in neovim and quit, I can't copy text in kitty, unless I focus to another window and then focus back.

To Reproduce
Steps to reproduce the behavior:

1. launch kitty, open file with nvim <file>
2. copy text A to unnamedplus by pressing yy in neovim
3. quit nvim, paste the text copied from neovim, the output should be text A as expected
4. select and copy text B in kitty
5. paste the copied text, the output is text A rather than text B
6. focus to another window (like another kitty terminal), and focus back
7. reproduce step 4 and 5, the output is text B as expected

Environment details

kitty 0.31.0 created by Kovid Goyal
Linux Shadow 6.6.4-zen1-1-zen #1 ZEN SMP PREEMPT_DYNAMIC Mon, 04 Dec 2023 00:28:58 +0000 x86_64
Arch Linux 6.6.4-zen1-1-zen (/dev/tty)

DISTRIB_ID="Arch"
DISTRIB_RELEASE="rolling"
DISTRIB_DESCRIPTION="Arch Linux"
Running under: Wayland
Frozen: False
Paths:
  kitty: /usr/bin/kitty
  base dir: /usr/lib/kitty
  extensions dir: /usr/lib/kitty/kitty
  system shell: /bin/zsh

Config options different from defaults:

Important environment variables seen by the kitty process:
        PATH                                /opt/google-cloud-cli/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/android-sdk/platform-tools:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/usr/lib/rustup/bin
        LANG                                en_US.UTF-8
        SHELL                               /bin/zsh
        GLFW_IM_MODULE                      ibus
        DISPLAY                             :1
        WAYLAND_DISPLAY                     wayland-1
        USER                                ch4ser
        XCURSOR_SIZE                        24
        XDG_SESSION_PATH                    /org/freedesktop/DisplayManager/Session1
        XDG_BACKEND                         wayland
        XDG_SEAT                            seat0
        XDG_SESSION_DESKTOP                 Hyprland
        XDG_SESSION_TYPE                    wayland
        XDG_CURRENT_DESKTOP                 Hyprland
        XDG_SEAT_PATH                       /org/freedesktop/DisplayManager/Seat0
        XDG_SESSION_CLASS                   user
        XDG_VTNR                            1
        XDG_SESSION_ID                      2
        XDG_RUNTIME_DIR                     /run/user/1000
        XDG_DATA_DIRS                       /home/ch4ser/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share

This debug output has been copied to the clipboard
~

neovim version

NVIM v0.9.4
Build type: Release
LuaJIT 2.1.1700008891

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/share/nvim"

Run :checkhealth for more info

Additional context

the issue can be reproduced with kitty --config NONE, and the neovim's configuration only contains set clipboard=unnamedplus in ~/.config/nvim/init.vim. The compositor is hyprland.

[kovidgoyal]

Update to neovim 0.10 which has native osc52 support and you should be fine. Or use https://github.com/ojroques/nvim-osc52

[ch4xer]

@kovidgoyal Actually, I think the issue has no related with osc52, since I can reproduce the issue with no configuration about ocs52, and of cause, the problem still exists when I use nvim-osc52 or use neovim nightly.

BTW, it seems the issue disappears when switching to other terminal emulators like gnome terminal or alacritty.

[kovidgoyal]

Then please come up with a reproducer without nvim involved.

[ch4xer]

@kovidgoyal You are right, the issue can be reproduced without neovim.

1. open kitty with kitty --config NONE
2. use mouse selection and ctrl-shift-cto copy text A in terminal
3. paste with ctrl-shift-v, the output is text A
4. execute echo hello | wl-copy
5. paste with ctrl-shift-v, the output is hello
6. repeat step 2 to copy text other than hello
7. paste with ctrl-shift-v, the output is still hello
8. focus to another window and focus back, and repeat step 6 and 7, the issue disappear.

I doubt the issue is related to wayland, my window manager is hyprland.

[kovidgoyal]

It is related to wayland and more specifically to how wl-copy works,
easily confirmed by running kitty with linux_display_backend x11 in
kitty.conf. As I said for nvim, use osc52 instead and you will be fine.
In this case instead of using wl-copy use kitten clipboard, which uses osc52 under the hood instead of talking to the wayland compositor directly unlike wl-copy

echo hello | kitten clipboard

[kovidgoyal]

Oh and incidentally your reproduction steps dont work on either gnome or kde under wayland, They work only with wl-roots based compositors. So maybe report it to sway or wl-roots, perhaps they can tell us what the issue is.

[ch4xer]

Thanks for your advice! A feasible mitigation method at this stage is not to use wl-clipboard in kitty and modify g:clipboard in neovim, which solves my issue.

vim.opt.clipboard = 'unnamed'
vim.g.clipboard = {
    name = "kittyClipboard",
    copy = {
        ["*"] = {"kitty","+kitten", "clipboard"},
        ["+"] = {"kitty","+kitten", "clipboard"},
    },
    paste = {
        ["*"] = { "kitty","+kitten", "clipboard", "--get-clipboard" },
        ["+"] = { "kitty","+kitten", "clipboard", "--get-clipboard" },
    },
    cache_enabled = 1,
}

[life5ign]

For reference, this was reported on tmux-yank: tmux-plugins/tmux-yank#151