Fix a refresh bug

On xmltab and listtab, the help text would be displayed in the input
after closing the tab.

src/tabs/basetabs.py

@@ -90,6 +90,7 @@ class Tab(object):
         if not hasattr(self, 'name'):
             self.name = self.__class__.__name__
         self.input = None
+        self.closed = False
         self._state = 'normal'
         self._prev_state = None
 
@@ -404,6 +405,7 @@ class Tab(object):
         """
         if self.input:
             self.input.on_delete()
+        self.closed = True
 
     def matching_names(self):
         """

src/tabs/listtab.py

@@ -141,6 +141,8 @@ class ListTab(Tab):
 
     @refresh_wrapper.always
     def reset_help_message(self, _=None):
+        if self.closed:
+            return True
         curses.curs_set(0)
         self.input = self.default_help_message
         self.input.resize(1, self.width, self.height-1, 0)

src/tabs/xmltab.py

@@ -20,7 +20,7 @@ from . import Tab
 import text_buffer
 import windows
 from xhtml import clean_text
-from decorators import command_args_parser
+from decorators import command_args_parser, refresh_wrapper
 from common import safeJID
 
 
@@ -256,12 +256,13 @@ class XMLTab(Tab):
         self.input.resize(1, self.width, self.height-1, 0)
         self.input.do_command("/") # we add the slash
 
+    @refresh_wrapper.always
     def reset_help_message(self, _=None):
+        if self.closed:
+            return True
         if self.core.current_tab() is self:
             curses.curs_set(0)
         self.input = self.default_help_message
-        self.input.refresh()
-        self.core.doupdate()
         return True
 
     def on_scroll_up(self):