Disable automatic runs of "windowing" test.

The windowing test suite has flaky timing in the "fade" tests.
Fixing it requires reworking the fade timing in xlbiff itself
to have sub-second accuracy.  In the mean time, don't have
autopkgtest run these tests.

NEWS

@@ -5,6 +5,10 @@ History
   Where applicable, changes are attributed to the people who submitted
   the ideas and, in many cases, patches and source code.
 
+ * Version 4.6.3 (16 Jan 2022)
+   + Developers: Disable automatic runs of flaky windowing test.
+     Test was introduced in version 4.5.4.
+
  * Version 4.6.2 (14 Jan 2022)
    + Developers: Tests do not write soft failures to stderr
 

debian/tests/control

@@ -4,8 +4,11 @@ Test-Command: TMPDIR="$AUTOPKGTEST_TMP" ./tests/test-scan-interface.sh
 Features: test-name=scantest
 Depends: @, xvfb, xauth, util-linux, xfonts-base, x11-utils
 
-Test-Command: TMPDIR="$AUTOPKGTEST_TMP" ./tests/test-windowing.sh
-  --logdir "$AUTOPKGTEST_ARTIFACTS" --as-installed
-Features: test-name=windowing
-Depends: @, xvfb, xauth, util-linux, xfonts-base, x11-utils, procps,
-  xdotool, metacity
+# This test has flaky timing in the "fade" tests.
+# Fixing it requires reworking the fade timing in xlbiff itself.
+# In the mean time, don't have autopkgtest run this test.
+# Test-Command: TMPDIR="$AUTOPKGTEST_TMP" ./tests/test-windowing.sh
+#   --logdir "$AUTOPKGTEST_ARTIFACTS" --as-installed
+# Features: test-name=windowing
+# Depends: @, xvfb, xauth, util-linux, xfonts-base, x11-utils, procps,
+#   xdotool, metacity