long jumps in ikhal don't crash it

Before, making the CalendarWidget jump to a date that was more than one
month away from the already loaded dates raised an exception.

fix #1200

1 files changed, 2 insertions, 2 deletions

diff --git a/khal/ui/calendarwidget.py b/khal/ui/calendarwidget.py
index fe911dd0..da2df441 100644
--- a/khal/ui/calendarwidget.py
+++ b/khal/ui/calendarwidget.py
@@ -418,14 +418,14 @@ class CalendarWalker(urwid.SimpleFocusListWalker):
         # will lead to an autoprepend which will f*ck up our estimation,
         # therefore better autoprepending anyway, even if it might not be
         # necessary
-        if new_focus <= 1:
+        while new_focus <= 1:
             self._autoprepend()
             week_diff = int((self.focus_date - a_day).days / 7)
             new_focus = self.focus - week_diff
         for offset in [0, -1, 1]:  # we might be off by a week
             row = new_focus + offset
             try:
-                if row >= len(self):
+                while row >= len(self):
                     self._autoextend()
                 column = self[row].get_date_column(a_day)
                 return row, column