Empty file after Cairo PNG export with cyrillic characters in filename
Windows 7, russian system language, msys2 with ru_RU.UTF-8 locale.
While exporting diagram to Cairo PNG if filename contains cyrillic characters ouptut *.png file is empty. May be fixed by replacement diacairo.c:99
with filename_crt = g_filename_to_utf8(filename, -1, NULL, NULL, NULL);