Playlist search is broken after adding a column

[Dustin Spicuzza]

On trunk, searching for things in a playlist does not currently work after you add a column. There are no errors shown in the console either... it also breaks when I change the playlist font, so I would suspect that something in the refresh_columns() function is broken.

The following also shows up after search breaks, though I'm not sure if it's related.

Traceback (most recent call last):
  File "/home/virtuald/src/exaile/exaile/xlgui/widgets/playlist_columns.py", line 432, in on_timeout
    self.get_tree_view().queue_draw()
AttributeError: 'NoneType' object has no attribute 'queue_draw'

[Dustin Spicuzza (dustin-virtualroadside)]

These GTK warnings also may be related:

/home/virtuald/src/exaile/exaile/xlgui/widgets/playlist.py:700: GtkWarning: IA__gdk_window_set_cursor: assertion `GDK_IS_WINDOW (window)' failed
  self.remove_column(col)
/home/virtuald/src/exaile/exaile/xlgui/widgets/playlist.py:682: GtkWarning: IA__gdk_window_set_cursor: assertion `GDK_IS_WINDOW (window)' failed
  self.append_column(playlist_column)

[Dustin Spicuzza (dustin-virtualroadside)]

Fixed in r4196