https://bugzilla.gnome.org/show_bug.cgi?id=765907
--- Comment #4 from Olivier Fourdan <[email protected]> ---
Created attachment 327202
--> https://bugzilla.gnome.org/attachment.cgi?id=327202&action=edit
[PATCH] wayland: fix up/down mix up in discrete events
The wayland specification for discrete step information for scroll and
other axes reads:
| The discrete value carries the directional information. e.g. a
| value of -2 is two steps towards the negative direction of this axis.
mutter sets a value of 1 for SCROLL_DOWN events and -1 for SCROLL_UP
events.
gdkdevice Wayland backend does the opposite, it translates a positive
discrete value as SCROLL_UP and a negative value as SCROLL_DOWN, which
ends up inverting the scrolling direction.
Fix the logic in gdkdevice Wayland to use a positive value as
SCROLL_DOWN and a negative value as SCROLL_UP so that it matches mutter
and weston logic.
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