CustomResult: guard against gdk.Screen.get_resolution() returning -1
CustomResult: guard against gdk.Screen.get_resolution() returning -1

gdk.Screen.get_resolution() can return -1 for the Windows backend
for unknown reasons; guard against this and use 96dpi instead.

alexey4petrov/reinteract,alexey4petrov/reinteract,alexey4petrov/reinteract