Version

1.3.0-dev
Slic3r-master.2017.11.07.1542.8ca6171.64bit

Operating system type + version

Win10/64bit

Behavior

When set infill to 0% the bridging speed input becomes disabled (grayed out)
If enter 1% to infill then i can enter bridging speed.
Funny, then while the input box is grayed out the value is still used for generating G-code and
i see it us used during the print.