XI2 events' subpixel precision may come slightly out of window positions
Submitted by Carlos Garnacho @carlosg
Assigned to Peter Hutterer @whot
Description
On gnome-shell, if I run xinput test-xi2, side-maximize it on the left by dragging the window to the left edge, the window will end up aligned to the left screen edge. However, moving the pointer towards that edge will sometimes issue events like:
EVENT type 6 (Motion) device: 2 (16) detail: 0 flags: root: -0.86/139.21 event: -0.86/75.21 buttons: modifiers: locked 0 latched 0 base 0 effective: 0 group: locked 0 latched 0 base 0 effective: 0 valuators: 0: -0.86 windows: root 0xd6 event 0x4600001 child 0x0
As can be seen in https://bugzilla.gnome.org/show_bug.cgi?id=756463 , this negative coordinate fools GTK+ into thinking it should synthesize crossing events as those happen.