Add support for using a different amount of fingers for swiping.

[MagneFire]

This removes the hardcoded prerequisite of using three fingers to use the swipe gesture. Instead one can configure it by setting gesture-swipe-fingers in the input section.

A working example is:

input {
    gesture-swipe-fingers 4
}

[YaLTeR]

Sorry for taking a while to respond. The reason is that I was thinking of different ways to configure this that don't impact future extensibility. For example, I'm thinking of possibly adding a different swipe gesture that will use 4 fingers, in addition to the current gestures using 3.

What's your use case for this, why do you want to change it?

[MagneFire]

Sorry for taking a while to respond. The reason is that I was thinking of different ways to configure this that don't impact future extensibility. For example, I'm thinking of possibly adding a different swipe gesture that will use 4 fingers, in addition to the current gestures using 3.

Hehe, no worries. I'm thankful for you giving the time to respond 😄

I thought about this too, as in creating a Gesture struct to store all gesture related configuration (not too dissimilar to Hyprland https://wiki.hyprland.org/Configuring/Variables/#gestures).

But as this struct would only contain one option decided to keep it simple and perhaps discuss this in this PR 😉

What's your use case for this, why do you want to change it?

I'm currently using fusuma to have the three finger horizontal gesture setup for previous and next actions (alt+Right and alt+Left). The vertical gesture is used for volume control. The four fingers gesture is setup for workspace related gestures.

This works well for me with GNOME and Hyprland, which is why I wanted the same thing for niri.