The problem with mouse (marble) jumps is adressed here:
https://bugzilla.libsdl.org/show_bug.cgi?id=3931
(spurious SDL_MOUSEMOTION events with SDL_HINT_MOUSE_RELATIVE_MODE_WARP
1 since Windows 10 Fall Creators update)
A workaround for SDL 2.0 is presented, but not for SDL 1.2 now.
It seems to be in principle a Windows 10 bug, a fix should come with the
next major update in spring.
Jürgen
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