addEventFocus

pub fn addEventFocus(self: *Self, opts: AddEventFocusOptions) std.mem.Allocator.Error!bool {
    self.positionMouseEventRemove();

    const target_id = opts.target_id orelse if (self.capture) |cap| cap.id else null;
    const winId = self.subwindows.windowFor(opts.pt);

    // normally the focus event is what focuses windows, but since the
    // base window is instantiated before events are added, it has to
    // do any event processing as the events come in, right now
    if (winId == self.data().id) {
        // focus the window here so any more key events get routed
        // properly
        self.focusSubwindow(self.data().id, null);
    }

    // add focus event
    self.event_num += 1;
    try self.events.append(self.arena(), Event{
        .num = self.event_num,
        .target_widgetId = target_id,
        .evt = .{
            .mouse = .{
                .action = .focus,
                .button = opts.button,
                .mod = self.modifiers,
                .p = opts.pt,
                .floating_win = winId,
            },
        },
    });

    try self.positionMouseEventAdd();
    return (self.data().id != winId);
}