Reset master to testing content

tests/x11_focus_child.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+"""Move X input focus into a child of the current test client window."""
+
+import ctypes
+import sys
+
+
+def main() -> None:
+    parent = int(sys.argv[1])
+    x11 = ctypes.CDLL("libX11.so.6")
+    x11.XOpenDisplay.argtypes = [ctypes.c_char_p]
+    x11.XOpenDisplay.restype = ctypes.c_void_p
+    x11.XCreateSimpleWindow.argtypes = [
+        ctypes.c_void_p, ctypes.c_ulong, ctypes.c_int, ctypes.c_int,
+        ctypes.c_uint, ctypes.c_uint, ctypes.c_uint,
+        ctypes.c_ulong, ctypes.c_ulong,
+    ]
+    x11.XCreateSimpleWindow.restype = ctypes.c_ulong
+    x11.XMapWindow.argtypes = [ctypes.c_void_p, ctypes.c_ulong]
+    x11.XSetInputFocus.argtypes = [
+        ctypes.c_void_p, ctypes.c_ulong, ctypes.c_int, ctypes.c_ulong,
+    ]
+    x11.XSync.argtypes = [ctypes.c_void_p, ctypes.c_int]
+    x11.XCloseDisplay.argtypes = [ctypes.c_void_p]
+
+    display = x11.XOpenDisplay(None)
+    if not display:
+        raise RuntimeError("X11 display unavailable")
+    try:
+        child = x11.XCreateSimpleWindow(display, parent, 0, 0, 1, 1, 0, 0, 0)
+        if not child:
+            raise RuntimeError("could not create child window")
+        x11.XMapWindow(display, child)
+        x11.XSetInputFocus(display, child, 2, 0)  # RevertToParent, CurrentTime
+        x11.XSync(display, 0)
+        print(child, flush=True)
+        sys.stdin.readline()
+        x11.XSetInputFocus(display, parent, 2, 0)
+        x11.XSync(display, 0)
+    finally:
+        x11.XCloseDisplay(display)
+
+
+if __name__ == "__main__":
+    main()