More problems deiscovered from the problem child. :) I think these fixes should improve reliability across the board for reading focused windows though. Needs testing.

tests/x11_frame_fixture.py

@@ -45,8 +45,9 @@ windows = dict(client=client, other=other, plain=plain, shared=shared,
 
 
 def configure(action):
+    frame.change_attributes(override_redirect=False)
     frame.configure(x=0, y=0, width=1916, height=994, border_width=0)
-    client.configure(width=1912, height=974)
+    client.configure(x=2, y=18, width=1912, height=974)
     client.delete_property(extentsAtom)
     selected = windows.get(action, client)
     if action == "zero-extents":
@@ -60,6 +61,12 @@ def configure(action):
         frame.configure(x=-30, y=40)
     elif action == "border":
         frame.configure(border_width=2)
+    elif action == "i3-frame":
+        frame.change_attributes(override_redirect=True)
+    elif action == "i3-run-dialog":
+        frame.change_attributes(override_redirect=True)
+        frame.configure(y=24, width=1916, height=989)
+        client.configure(y=0, width=1912, height=987)
     root.change_property(activeAtom, Xatom.WINDOW, 32,
                          [0 if action == "empty" else selected.id])
     connection.sync()