GtkFileSelector does not work with non-ascii characters

[Alexander Larsson <alla lysator liu se>]

If i have a file with non-ascii characters in the name (like the latin-1
swedish characters öäåÖÄÅ) GtkFileSelector spews:
** WARNING **: Invalid UTF8 string passed to pango_layout_set_text()

Selecting and unselecting the offending file (shown as blank) segfaults,
with a well known (to me) 'clearing GtkEntry containing broken utf8'
backtrace.

/ Alex