test: don't run the MT pressure test on devices without MT pressure

This test worked because on devices that don't use pressure the touches were
reset when BTN_TOUCH when to 0, triggering the 'ignore fake fingers when no
real fingers are down' behavior. But this is a different code path than the
pressure handling, so let's separate those tests.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit 990da54)

test/test-touchpad-tap.c

@@ -1591,13 +1591,19 @@ START_TEST(touchpad_3fg_tap_quickrelease)
 }
 END_TEST
 
-START_TEST(touchpad_3fg_tap_hover_btntool)
+START_TEST(touchpad_3fg_tap_pressure_btntool)
 {
 	struct litest_device *dev = litest_current_device();
 	struct libinput *li = dev->libinput;
 
-	if (libevdev_get_abs_maximum(dev->evdev,
-				     ABS_MT_SLOT) >= 2)
+	if (libevdev_get_abs_maximum(dev->evdev, ABS_MT_SLOT) >= 2)
+		return;
+
+	/* libinput doesn't export when it uses pressure detection, so we
+	 * need to reconstruct this here. Specifically, semi-mt devices are
+	 * non-mt in libinput, so if they have ABS_PRESSURE, they'll use it.
+	 */
+	if (!libevdev_has_event_code(dev->evdev, EV_ABS, ABS_MT_PRESSURE))
 		return;
 
 	litest_enable_tap(dev->libinput_device);
@@ -1616,6 +1622,56 @@ START_TEST(touchpad_3fg_tap_hover_btntool)
 	/* drop below the pressure threshold in the same frame as starting a */
 	litest_event(dev, EV_ABS, ABS_MT_PRESSURE, 3);
 	litest_event(dev, EV_ABS, ABS_PRESSURE, 3);
+	litest_event(dev, EV_KEY, BTN_TOOL_DOUBLETAP, 0);
+	litest_event(dev, EV_KEY, BTN_TOOL_TRIPLETAP, 1);
+	litest_event(dev, EV_SYN, SYN_REPORT, 0);
+	libinput_dispatch(li);
+
+	litest_push_event_frame(dev);
+	litest_event(dev, EV_KEY, BTN_TOOL_DOUBLETAP, 1);
+	litest_event(dev, EV_KEY, BTN_TOOL_TRIPLETAP, 0);
+	litest_pop_event_frame(dev);
+	litest_assert_empty_queue(li);
+
+	litest_touch_up(dev, 0);
+	litest_touch_up(dev, 1);
+}
+END_TEST
+
+START_TEST(touchpad_3fg_tap_hover_btntool)
+{
+	struct litest_device *dev = litest_current_device();
+	struct libinput *li = dev->libinput;
+
+	if (libevdev_get_abs_maximum(dev->evdev, ABS_MT_SLOT) >= 2)
+	    return;
+
+	/* libinput doesn't export when it uses pressure detection, so we
+	 * need to reconstruct this here. Specifically, semi-mt devices are
+	 * non-mt in libinput, so if they have ABS_PRESSURE, they'll use it.
+	 */
+	if (libevdev_has_event_code(dev->evdev, EV_ABS, ABS_MT_PRESSURE))
+		return;
+
+	if (libevdev_has_property(dev->evdev, INPUT_PROP_SEMI_MT) &&
+	    libevdev_has_event_code(dev->evdev, EV_ABS, ABS_PRESSURE))
+		return;
+
+	litest_enable_tap(dev->libinput_device);
+	litest_enable_edge_scroll(dev);
+
+	litest_drain_events(li);
+
+	litest_touch_down(dev, 0, 50, 50);
+	litest_touch_down(dev, 1, 70, 50);
+	libinput_dispatch(li);
+
+	litest_touch_move_to(dev, 0, 50, 50, 50, 70, 10, 0);
+	litest_touch_move_to(dev, 1, 70, 50, 50, 70, 10, 0);
+	litest_drain_events(li);
+
+	/* drop below the pressure threshold in the same frame as starting a
+	 * third touch  */
 	litest_event(dev, EV_KEY, BTN_TOUCH, 0);
 	litest_event(dev, EV_KEY, BTN_TOOL_DOUBLETAP, 0);
 	litest_event(dev, EV_KEY, BTN_TOOL_TRIPLETAP, 1);
@@ -3316,6 +3372,7 @@ litest_setup_tests_touchpad_tap(void)
 	litest_add("tap-3fg:3fg", touchpad_3fg_tap_tap_again, LITEST_TOUCHPAD, LITEST_SINGLE_TOUCH);
 	litest_add("tap-3fg:3fg", touchpad_3fg_tap_quickrelease, LITEST_TOUCHPAD, LITEST_SINGLE_TOUCH);
 	litest_add("tap-3fg:3fg", touchpad_3fg_tap_hover_btntool, LITEST_TOUCHPAD, LITEST_SINGLE_TOUCH);
+	litest_add("tap-3fg:3fg", touchpad_3fg_tap_pressure_btntool, LITEST_TOUCHPAD, LITEST_SINGLE_TOUCH);
 	litest_add_for_device("tap-3fg:3fg", touchpad_3fg_tap_btntool_pointerjump, LITEST_SYNAPTICS_TOPBUTTONPAD);
 	litest_add("tap-4fg:4fg", touchpad_4fg_tap, LITEST_TOUCHPAD, LITEST_SINGLE_TOUCH|LITEST_SEMI_MT);
 	litest_add("tap-4fg:4fg", touchpad_4fg_tap_quickrelease, LITEST_TOUCHPAD, LITEST_SINGLE_TOUCH|LITEST_SEMI_MT);