FS-UAE on OS X does not receive mouse motion events when window is not focused

[FrodeSolheim]

FS-UAE on OS X does not get mouse move events when window is inactive. This is normally not a problem, but with mouse integration enabled, this is a bit annoying. It would be best if the window receives mouse motion events even while inactive, so you can "interact" with it as it were a native application (i.e. move cursor over windows inside Workbench and click on them to activate the window (and FS-UAE)).

[FrodeSolheim]

This is either something SDL 2 or OS X itself does.