Gestures overhaul, part 3

Alice Mikhaylenko requested to merge wip/exalm/gestures-part-3 into master

See !605 (closed), !821 (merged), !825 (merged)

The third part adds a swipe tracker and uses it to implement consistent dragging, touchpad scrolling and 4-finger gestures on both touchpad and touchscreen for overview and app grid, and the same 4-finger gesture for switching workspaces.

Currently includes !821 (merged) and !825 (merged)

Fixes #1338 (closed) completely, fixes #756 (closed)


Edited by Alice Mikhaylenko

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