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Description of problem:
When moving mouse in left-down direction (where e.g. Windows start button is by default), mouse pointer moves just down, leftward component of the motion gets discarded. All the other quadrants are OK.

Happens with both RHEL 6 and RHEL 7 spice servers so the bug is likely in spice-gtk.

Version-Release number of selected component (if applicable):
spice-gtk3-0.26-5.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. connect to a VM with mouse in server mode (with stopped agent or agent_mouse=off server option and with disabled vmmouse driver)
2. click into the VM
3. move mouse in bottom-left direction

Actual results:
mouse pointer moves just down

Expected results:
mouse moves moves in the same direction as the mouse itself

Additional info:

I can not reproduce this bug on RHEL7.2
Using spice-gtk3-0.26-5.el7.x86_64.

Again, is seems something unique to my system and I don't have a clue what might be wrong. Let's close until it's clearer what's going on (or if it bites someone else in addition to me).