Use the event handler to refresh when the tab changes

.gitlab-ci.yml

@@ -48,7 +48,7 @@ pytest-3.5:
     - python3 setup.py install
     - py.test -v test/
 
-pyest-3.6:
+pytest-3.6:
   stage: test
   image: python:3.6
   script:
@@ -61,7 +61,7 @@ pyest-3.6:
     - python3 setup.py install
     - py.test -v test/
 
-pyest-latest:
+pytest-latest:
   stage: test
   image: python:3.6
   script:

poezio/core/commands.py

@@ -214,9 +214,6 @@ class CommandCore:
             if match is None:
                 return
             self.core.tabs.set_current_tab(match)
-        old_tab.on_lose_focus()
-        self.core.tabs.current_tab.on_gain_focus()
-        self.core.refresh_window()
 
     @command_args_parser.quoted(2)
     def move_tab(self, args):
@@ -496,9 +493,6 @@ class CommandCore:
             tab = tabs.BookmarksTab(self.core, self.core.bookmarks)
             self.core.tabs.append(tab)
             self.core.tabs.set_current_tab(tab)
-        old_tab.on_lose_focus()
-        tab.on_gain_focus()
-        self.core.refresh_window()
 
     @command_args_parser.quoted(0, 1)
     def remove_bookmark(self, args):

poezio/core/core.py

@@ -98,6 +98,8 @@ class Core:
         self.plugins_autoloaded = False
         self.plugin_manager = PluginManager(self)
         self.events = events.EventHandler()
+        self.events.add_event_handler('tab_change',
+            self.on_tab_change)
 
         self.tabs = Tabs(self.events)
         self.previous_tab_nb = 0
@@ -347,6 +349,12 @@ class Core:
 
         self.add_configuration_handler("", self.on_any_config_change)
 
+    def on_tab_change(self, old_tab, new_tab):
+        """Whenever the current tab changes, change focus and refresh"""
+        old_tab.on_lose_focus()
+        new_tab.on_gain_focus()
+        self.refresh_window()
+
     def on_any_config_change(self, option, value):
         """
         Update the roster, in case a roster option changed.
@@ -1028,19 +1036,13 @@ class Core:
         """
         rotate the rooms list to the right
         """
-        self.tabs.current_tab.on_lose_focus()
         self.tabs.next()
-        self.tabs.current_tab.on_gain_focus()
-        self.refresh_window()
 
     def rotate_rooms_left(self, args=None):
         """
         rotate the rooms list to the right
         """
-        self.tabs.current_tab.on_lose_focus()
         self.tabs.prev()
-        self.tabs.current_tab.on_gain_focus()
-        self.refresh_window()
 
     def go_to_room_number(self):
         """