Kitty image protocol visual glitches when updating placement location

[evanc577]

What Operating System(s) are you seeing this problem on?

Linux Wayland

Which Wayland compositor or X11 Window manager(s) are you using?

KDE Plasma 6.1.3 (Wayland)

WezTerm version

20240203-110809-5046fc22

Did you try the latest nightly build to see if the issue is better (or worse!) than your current version?

No

Describe the bug

Background

In https://github.com/ncmpcpp/ncmpcpp/pull/437, an ncurses MPD client, I've implemented album artwork via the Kitty terminal graphics protocol. When scrolling ncurses windows, any existing images on screen will also scroll, potentially offscreen. To have the image always exist at a fixed location, I update the image placement back to the desired place after every scroll event by re-transmitting the image ID and placement ID of the displayed image at the desired location.

Graphical glitches

The image remains in the correct location after scrolling, but glitches occur above or below depending on scroll direction.

Wezterm	Kitty	Konsole

To Reproduce

Unfortunately I don't have a minimal setup.

To reproduce, set up an MPD server with music containing artwork, and use https://github.com/ncmpcpp/ncmpcpp/pull/437 with the following configuration:

albumart = yes
albumart_backend = kitty

startup_screen = artwork
startup_slave_screen = playlist
startup_slave_screen_focus = yes
locked_screen_width_part = 25

Then play a song and scroll a window.

Configuration

no config

Expected Behavior

Image stays in a fixed location during ncurses scroll and doesn't exhibit glitches

Logs

No response

Anything else?

No response