+ * But here's a new kink that started showing up in late 2014: GNOME programs
+ * don't actually select for or receive KeyPress events! They do it behind
+ * the scenes through some kind of Input Method magic, even when running in
+ * an en_US locale. However, in that case, those applications *do* seem to
+ * update the _NET_WM_USER_TIME on their own windows every time they have
+ * received a secret KeyPress, so we *also* monitor that property on every
+ * window, and treat changes to it as identical to KeyPress.
+ *