linux (kwin+x11): window opening at full height

I'm trying to find the root cause of alacritty #1817. I've determined that the issue was introduced in 1b74822cfc0cb7fba4ed4940a3faae9499fcda95. The problem does not occur on wayland unless running over XWayland.

If I build alacritty against that commit I've found that commenting out the following block from src/platform/linux/x11/mod.rs fixes the incorrect window size.

/*                    if last_hidpi_factor != new_hidpi_factor {
                        events.dpi_changed = Some(WindowEvent::HiDpiFactorChanged(new_hidpi_factor));
                        let (new_width, new_height, flusher) = window.adjust_for_dpi(
                            last_hidpi_factor,
                            new_hidpi_factor,
                            width,
                            height,
                        );
                        flusher.queue();
                        shared_state_lock.dpi_adjusted = Some((new_width, new_height));
                    }
*/

I haven't had much luck minimizing the problem further. I have also built against v0.18.0 and the problem still exists. Removing the equivalent section of code doesn't help either. Any help in narrowing down this issue is appreciated.

Reproduce the incorrect window height under Linux X11 or XWayland, then compare the behavior around commit 1b74822cfc0cb7fba4ed4940a3faae9499fcda95. Read src/platform/linux/x11/mod.rs, especially the shown HiDpiFactorChanged block and its equivalent in v0.18.0. Done means the root cause is isolated and the window sizing behavior is corrected without regressing Wayland.