DECRQSS +q5463;524742;73657472676266;73657472676262$qm appears in terminal

[lpar]

Problem

When I start nvim 0.10.0 I see +q5463;524742;73657472676266;73657472676262$qm appear at the top left of the terminal window, with the $qm in italic and darker. After a fraction of a second it disappears and the regular initial window contents appear.

Using a terminal to a remote Mac, I see p$qm+q5463;524742;73657472676266;73657472676262$qm+q4D73 with the $qm+q4D73 in dark italic.

I didn't see this with 0.9.5.

It still does it with nvim --clean.

I'm guessing this is due to DECRQSS terminal escapes that aren't implemented by macOS terminal. Apparently they aren't implemented for alacritty either.

Steps to reproduce

nvim --clean

Expected behavior

Initial NVIM v0.10.0 blank window appears.

Neovim version (nvim -v)

NVIM v0.10.0

Vim (not Nvim) behaves the same?

no, 9.0.2142

Operating system/version

macOS 14.5

Terminal name/version

macOS terminal

$TERM environment variable

xterm-256color

Installation

Homebrew

[justinmk]

I'm certain this is discussed in existing, closed issues.

[clason]

Don't use Apple Terminal, it's plain broken. iTerm2 (3.5, the betas are release candidates now) will do in a pinch.

[gpanders]

I'm guessing this is due to DECRQSS terminal escapes that aren't implemented by macOS terminal. Apparently alacritty/alacritty#7184.

The terminal should not print an escape sequence just because it's unimplemented. This is just Apple Terminal being terrible, as usual.

We disabled DECRQSS for Apple Terminal in #28453, but that won't work for a remote SSH session (the remote session doesn't know anything about the terminal emulator). We are also sendin XTGETTCAP and DECRQSS requests to determine truecolor support in _defaults.lua, where we don't have any guards for Apple Terminal.

A workaround in the meantime is to set COLORTERM=truecolor in your remote environment and also use set notermguicolors in your init file. Setting $COLORTERM this way will prevent Nvim from querying the terminal (it will assume that the terminal does support truecolor), and then disabling 'termguicolors' in your init file will disable it again.

[zgpio]

Same issue on windows cmd.exe
use nvim --clean to reproduce.