Override redirect Popup menu type window under Xwayland can not be displayed on the second XMapWindow.

[wengxt]

What Happened?

For override redirect window that has popup menu ewmh window type, if it's mapped and unmapped once, any following map will not be able to make window visible.

Steps to Reproduce

1. Minimum test code

#include <iostream>
#include <X11/X.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <unistd.h>
int main() {
    
    Display* display = XOpenDisplay(nullptr);
    Window w = XCreateSimpleWindow(display, DefaultRootWindow(display), 100, 100, 100, 100, 0, 0, 0);
    XSetWindowAttributes a;
    a.override_redirect = True;
    XChangeWindowAttributes(display, w, CWOverrideRedirect, &a);
    auto windowType = XInternAtom(display, "_NET_WM_WINDOW_TYPE", False);

    auto popup = XInternAtom(display, "_NET_WM_WINDOW_TYPE_POPUP_MENU", False);
    XChangeProperty(display, w, windowType, XA_ATOM, 32, PropModeReplace, (const unsigned char *)&popup, 1);
    XSelectInput(display, w, ExposureMask);
    XMapRaised(display, w);
    XFlush(display);
    sleep(3);
    XUnmapWindow(display, w);
    XFlush(display);
    sleep(3);
    XMapRaised(display, w);
    XFlush(display);
    XEvent event;
    while (XNextEvent(display, &event) == 0) {
        std::cout << event.type << std::endl;

    }
    return 0;
}

2. g++ main.cpp -lX11
3. ./a.out

Expected Behavior

The code maps a window for 3 seconds, then unmap it for 3 seconds. And map again.
On the second map, the window is not visible.

This only happens when using Secure Session, Classic Session is work as expected.

Video under secure session:

secure-session.mp4

Video under classic session:

classic-session.mp4

OS Version

8.x (Circe)

Session Type

Secure Session (Wayland)

Software Version

Latest release (I have run all updates)

Log Output

No response

Hardware Info

VirtualBox

[leolost2605]

This might be a mutter bug: https://gitlab.gnome.org/GNOME/mutter/-/issues/2732

[wengxt]

@leolost2605 I tried gnome-shell on the exact same system, and doesn't have the same issue. (gnome-shell --version shows 46.0)

Also, the app in https://gitlab.gnome.org/GNOME/mutter/-/issues/2732 is an gtk app, very likely is running under native wayland, not the Xwayland in this report.

[leolost2605]

Hmm I admit I didn't take a very close look at the bug report I linked because I didn't think that this is Gala specific since we don't do a whole lot of the low level stuff...