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I'm searching for a tool to test my codes, I always do it using Xephyr for Xorg. Now Is there any alternative for Xephyr in Wayland?

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Wayland environments like Gnome 3 or KDE 5 use a rootless Xwayland to support X applications; Xephyr still works then.

For pure Wayland environments there is currently no nested X server available, afaik. Xpra may support this as soon as it is ported to GTK3 and python 3. But that port is not ready yet.

For now, you can run Xwayland as a Wayland client (not rootless in this case). With given environment variables WAYLAND_DISPLAY and XDG_RUNTIME_DIR, you can run Xwayland :1 and start X applications with DISPLAY=:1 xterm.

Xwayland appears as a fullscreen borderless window. Unfortunately, it is not possible to set another screen size for Xwayland. In Gnome 3 you can move it around with SUPER+LeftMouseButton, other Wayland compositors may have a different setup to move borderless clients. Instead of moving Xwayland window, you can use ALT+Tab in many desktop environments to switch to the hidden applications.

mviereck
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