Bug 498725

SUMMARY
The 3 and 4 finger gestures implemented by kwin are inconsistent across touchpads and touchscreens. These should be largely the same.

Touchpad:
3 AND 4 fingers left gesture: move to left virtual desktop (if present)
3 AND 4 fingers right gesture: move to right virtual desktop (if present)
3 finger up gesture: move to above virtual desktop (if present)
3 finger down gesture: move to below virtual desktop (if present)
4 finger up gesture: show overview/cycle forward (default view, overview, grid view)
4 finger down gesture: show grid view/cycle backward (default view, overview, grid view)


Touchscreen:
3 finger left gesture: move to left virtual desktop (if present)
3 finger right gesture: move to right virtual desktop (if present)
3 finger up gesture: show overview/cycle forward (default view, overview, grid view)
3 finger down gesture: show grid view/cycle backward (default view, overview, grid view)
4 finger gestures: not implemented (!)

This introduces significant problems for touch users with at least 2 rows of virtual desktops, as they cannot switch to above or below rows of virtual desktops without using 3/4 finger gestures alone!


STEPS TO REPRODUCE
1. Have a device with both a touchscreen and a touchpad (touchscreen laptop)
2. Ensure at least 2 rows of virtual desktops are enabled
3. Try to use 3/4 finger gestures on touchscreen only to switch to higher/lower virtual desktop rows

OBSERVED RESULT
Nothing happens (4 finger up/down gestures), or overview/grid view is toggled (3 finger up/down gestures).

EXPECTED RESULT
Toggle overview/grid view (4 finger up/down gestures), or move up/down virtual desktop grid (3 finger up/down gestures).
Also expect 4 finger left/right gestures to switch virtual desktops (I don't think this is an optimal bind, but we should strive for consistency until a better use is decided for them).

OS VERSIONS
Arch Linux, KDE Plasma
KDE Plasma Version: 6.2.90
KDE Frameworks Version:  6.10.0
Qt Version: 6.9.0

ADDITIONAL INFORMATION
I don't really like how 3/4 finger left/right gestures do the same thing on a touchpad, and I suspect this will be changed in the future from looking at some other bug reports/discussions (https://invent.kde.org/plasma/kwin/-/issues/59, https://invent.kde.org/plasma/kwin/-/issues/188, etc). This bug should not attempt to address these issues as well, rather just make the gestures consistent across touchpad/touchscreen.