Exwm does not resize correctly in Xephyr without manually calling xrandr

[KhalfaniW]

Description

When running EXWM inside a nested X session with Xephyr, the window size doesn't update properly when resizing the Xephyr window, even after calling (exwm-randr-refresh). However, running xrandr command manually allows it calling (exwm-randr-refresh) to work.

Steps to Reproduce

1. Start EXWM inside Xephyr
2. Resize the Xephyr window
3. Call (exwm-randr-refresh)

---

• Current Behavior
  Window size remains unchanged after exwm-randr-refresh when resizing Xephyr window.

• Expected Behavior
  Window size should update properly after resizing and calling exwm-randr-refresh.
  Or it should resize automatically because exwm-randr--on-ConfigureNotify should "Refresh when any RandR 1.5 monitor changes."

Workaround

Running the following code works as expected:

(progn
  (shell-command-to-string "xrandr")
  (exwm-randr-refresh))

---

version details

$ xrandr --version
xrandr program version       1.5.1
Server reports RandR version 1.6

$ emacs --version
GNU Emacs 29.4

  xserver-xephyr             2:21.1.4-2ubuntu1.7~22.04.12     

[latest exwm version]