Remove unused SizeManager argument, and simplify its import.

poezio/core/core.py

@@ -104,7 +104,7 @@ class Core(object):
         self.plugin_manager = PluginManager(self)
         self.events = events.EventHandler()
 
-        self.size = SizeManager(self, windows.Win)
+        self.size = SizeManager(self)
 
         # Set to True whenever we consider that we have been disconnected
         # from the server because of a legitimate reason (bad credentials,

poezio/size_manager.py

@@ -4,7 +4,7 @@ Size Manager:
     specific tabs
 """
 
-from poezio import windows
+from poezio.windows import base_wins
 
 THRESHOLD_WIDTH_DEGRADE = 45
 THRESHOLD_HEIGHT_DEGRADE = 10
@@ -14,18 +14,17 @@ FULL_HEIGHT_DEGRADE = 10
 
 class SizeManager(object):
 
-    def __init__(self, core, win_cls):
-        self._win_class = win_cls
+    def __init__(self, core):
         self._core = core
 
     @property
     def tab_degrade_x(self):
-        _, x = windows.base_wins.TAB_WIN.getmaxyx()
+        _, x = base_wins.TAB_WIN.getmaxyx()
         return x < THRESHOLD_WIDTH_DEGRADE
 
     @property
     def tab_degrade_y(self):
-        y, x = windows.base_wins.TAB_WIN.getmaxyx()
+        y, x = base_wins.TAB_WIN.getmaxyx()
         return y < THRESHOLD_HEIGHT_DEGRADE
 
     @property