testcase: add redirect_when_unmapped_window_has_shadow

While working on this PR, I introduced a bug where shadow images for
unmapped windows aren't properly recreated after unredirect/redirect.

The shadow image is freed during unredirect, OTOH redirect only set
IMAGE_STALE flags for mapped window, thus the shadow images for unmapped
windows will be missing.

This bug is already fixed in the previous commit. But the testcase is
good to keep nonetheless.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

tests/run_tests.sh

@@ -17,4 +17,5 @@ eval `dbus-launch --sh-syntax`
 ./run_one_test.sh $exe /dev/null testcases/issue299.py
 ./run_one_test.sh $exe configs/issue465.conf testcases/issue465.py
 ./run_one_test.sh $exe configs/clear_shadow_unredirected.conf testcases/clear_shadow_unredirected.py
+./run_one_test.sh $exe configs/clear_shadow_unredirected.conf testcases/redirect_when_unmapped_window_has_shadow.py
 ./run_one_test.sh $exe configs/issue394.conf testcases/issue394.py

tests/testcases/redirect_when_unmapped_window_has_shadow.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+import xcffib.xproto as xproto
+import xcffib
+import time
+from common import set_window_name
+
+conn = xcffib.connect()
+setup = conn.get_setup()
+root = setup.roots[0].root
+visual = setup.roots[0].root_visual
+depth = setup.roots[0].root_depth
+
+name = "_NET_WM_STATE"
+name_atom = conn.core.InternAtom(False, len(name), name).reply().atom
+atom = "ATOM"
+atom_atom = conn.core.InternAtom(False, len(atom), atom).reply().atom
+fs = "_NET_WM_STATE_FULLSCREEN"
+fs_atom = conn.core.InternAtom(False, len(fs), fs).reply().atom
+
+wid1 = conn.generate_id()
+print("Window 1 id is ", hex(wid1))
+
+# Create a window
+conn.core.CreateWindowChecked(depth, wid1, root, 0, 0, 100, 100, 0, xproto.WindowClass.InputOutput, visual, 0, []).check()
+
+# Map the window
+print("mapping 1")
+conn.core.MapWindowChecked(wid1).check()
+
+time.sleep(0.5)
+
+print("unmapping 1")
+# Unmap the window
+conn.core.UnmapWindowChecked(wid1).check()
+
+time.sleep(0.5)
+
+# create and map a second window
+wid2 = conn.generate_id()
+print("Window 2 id is ", hex(wid2))
+conn.core.CreateWindowChecked(depth, wid2, root, 200, 0, 100, 100, 0, xproto.WindowClass.InputOutput, visual, 0, []).check()
+print("mapping 2")
+conn.core.MapWindowChecked(wid2).check()
+time.sleep(0.5)
+
+# Set fullscreen property on the second window, causing screen to be unredirected
+conn.core.ChangePropertyChecked(xproto.PropMode.Replace, wid2, name_atom, atom_atom, 32, 1, [fs_atom]).check()
+
+time.sleep(0.5)
+
+# Unset fullscreen property on the second window, causing screen to be redirected
+conn.core.ChangePropertyChecked(xproto.PropMode.Replace, wid2, name_atom, atom_atom, 32, 0, []).check()
+
+time.sleep(0.5)
+
+# map the first window again
+print("mapping 1")
+conn.core.MapWindowChecked(wid1).check()
+
+time.sleep(0.5)
+
+# Destroy the windows
+conn.core.DestroyWindowChecked(wid1).check()
+conn.core.DestroyWindowChecked(wid2).check()