sajty/ember — comment on commit bdf80d1bece1cc5512eebeb41a6e962b5c3b2557
File: src/services/input/Input.cpp line 278
By erikhjortsberg:

It's used in many of the IInputAdapters. For example when rotating a 3d model in the model editor. Or when moving a corner of a polygon when altering an area.
Of course, since OIS lacks mouse warping we can't do it like this. Instead the input adapters need to actively listen for events and grab the mouse when activated (for example when pressing and holding the mouse button on a mesh preview window).