I am also experiencing this on Ubuntu Gnome 16.04 (running Gnome Shell 3.18), but it seems to be platform-independent, so that information likely doesn't help.
It's pretty obvious to me that raw mouse input, as was used previous in 1.14.2 and below, is no longer being used in 1.14.3.
The only people that would be unaffected by this bug are those who were already using a flat pointer acceleration curve globally.
So, the workaround for this–as found by a user above, and until raw input is supported again as it was before–is disabling mouse acceleration altogether, and comes at the cost of pointer speed while using GUIs like inventory, trading, enchanting, etc. Fullscreen vs windowed, depending on the platform, can also affect pointer behavior, as was described by another user above.
I really hope this was an accident, because if a decision was actually made to remove support for raw mouse input, it was a phenomenally misguided one.
EDIT: For those like me on Linux and still using X11 (not Wayland), the following command will get your current pointer acceleration curve:
xset q | grep -A 1 Pointer
Its output will look something like:
Pointer Control:
acceleration: X/Y threshold: Z
You can then disable (and later re-enable) acceleration with the following commands, making sure that X, Y, and Z correspond to your curve from before. (Note the 0 instead of X in the first command; this is what disables acceleration.)
Ben Landin
I am also experiencing this on Ubuntu Gnome 16.04 (running Gnome Shell 3.18), but it seems to be platform-independent, so that information likely doesn't help.
It's pretty obvious to me that raw mouse input, as was used previous in 1.14.2 and below, is no longer being used in 1.14.3.
The only people that would be unaffected by this bug are those who were already using a flat pointer acceleration curve globally.
So, the workaround for this–as found by a user above, and until raw input is supported again as it was before–is disabling mouse acceleration altogether, and comes at the cost of pointer speed while using GUIs like inventory, trading, enchanting, etc. Fullscreen vs windowed, depending on the platform, can also affect pointer behavior, as was described by another user above.
I really hope this was an accident, because if a decision was actually made to remove support for raw mouse input, it was a phenomenally misguided one.
EDIT: For those like me on Linux and still using X11 (not Wayland), the following command will get your current pointer acceleration curve:
Its output will look something like:
You can then disable (and later re-enable) acceleration with the following commands, making sure that X, Y, and Z correspond to your curve from before. (Note the 0 instead of X in the first command; this is what disables acceleration.)