Touchpad Scrolling Not Working in Tabbed/Stacked Mode

[rmasad]

I've encountered an issue while using Regolith with the Sway window manager, specifically when windows are in tabbed or stacked mode. The problem is that scrolling through the windows (to change the active one) with the touchpad does not work, whereas using a mouse's scroll wheel functions as expected.

Environment:
Sway Version: 1.8
Operating System: Ubuntu

Steps to Reproduce:
Open multiple windows in Sway under Regolith.
Change the window layout to either tabbed or stacked mode.
Attempt to scroll within a window title using the touchpad.

Expected Behavior:
Scrolling with the touchpad should allow me to change the active window, how it works when using a mouse.

Actual Behavior:
Scrolling with the touchpad has no change in which the active window is, while mouse scrolling works perfectly.

Thank you for your time and effort in maintaining Sway.

[WhyNotHugo]

I can confirm that the issue remains present in master.

[GalaxySnail]

Related to #7473. #7473 is about wl_pointer.axis_value120, while this issue is about wl_pointer.axis.

The related source code is here:

sway/sway/input/seatop_default.c

Lines 754 to 778 in 0b84d82

	// Scrolling on a tabbed or stacked title bar (handled as press event)
	if (!handled && (on_titlebar || on_titlebar_border)) {
	struct sway_node *new_focus;
	enum sway_container_layout layout = container_parent_layout(cont);
	if (layout == L_TABBED || layout == L_STACKED) {
	struct sway_node *tabcontainer = node_get_parent(node);
	struct sway_node *active =
	seat_get_active_tiling_child(seat, tabcontainer);
	list_t *siblings = container_get_siblings(cont);
	int desired = list_find(siblings, active->sway_container) +
	roundf(scroll_factor * event->delta_discrete / WLR_POINTER_AXIS_DISCRETE_STEP);
	if (desired < 0) {
	desired = 0;
	} else if (desired >= siblings->length) {
	desired = siblings->length - 1;
	}
	struct sway_container *new_sibling_con = siblings->items[desired];
	struct sway_node *new_sibling = &new_sibling_con->node;
	// Use the focused child of the tabbed/stacked container, not the
	// container the user scrolled on.
	new_focus = seat_get_focus_inactive(seat, new_sibling);
	} else {
	new_focus = seat_get_focus_inactive(seat, &cont->node);
	}