Created attachment 196493 [details]
minimal test case

When using a gtk file chooser dialog with more than one
filter, a combo box is displayed enabling the user to
select a filter. In GTK 2.24.6, I find that this combo
is not displayed correctly: the list of filters appears, 
but the combo widget is much too narrow: for each of the 
filter names, only the first two characters are shown, 
followed by an ellipsis, making the names illegible.

This is on Linux, using the plain vanilla default GTK
theme. The problem is not present with GTK 2.24.5, nor
is it present if the code is built against GTK 3.0.12.
The installed pango version is 1.29.3. Everything is
built with gcc 4.6.1.

The change from GTK 2.24.5 to 2.24.6 that triggers this
effect is the addition of new material in the function
filter_create(), in gtkfilechooserdefault.c. Here is
that new material:

<code-snippet>
  /* Get the combo's text renderer and set ellipsize parameters */
  cells = gtk_cell_layout_get_cells (GTK_CELL_LAYOUT (impl->filter_combo));
  g_assert (cells);
  cell = cells->data;

  g_object_set (G_OBJECT (cell),
		"ellipsize", PANGO_ELLIPSIZE_END,
		NULL);

  g_list_free (cells);
</code-snippet>