Revert "touchpad: reset the motion history on significant negative pressure changes"

We will reinstate the hysteresis for all devices making the negative
pressure check unncessary.

This reverts commit ef48c07a.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

src/evdev-mt-touchpad.c

@@ -357,7 +357,6 @@ tp_process_absolute(struct tp_dispatch *tp,
 			tp_end_sequence(tp, t, time);
 		break;
 	case ABS_MT_PRESSURE:
-		t->pressure_delta = e->value - t->pressure;
 		t->pressure = e->value;
 		t->dirty = true;
 		tp->queued |= TOUCHPAD_EVENT_OTHERAXIS;
@@ -1043,9 +1042,6 @@ tp_process_state(struct tp_dispatch *tp, uint64_t time)
 		if (!t->dirty)
 			continue;
 
-		if (t->pressure_delta < -7)
-			tp_motion_history_reset(t);
-
 		if (tp_detect_jumps(tp, t)) {
 			if (!tp->semi_mt)
 				log_bug_kernel(tp_libinput_context(tp),

src/evdev-mt-touchpad.h

@@ -155,7 +155,6 @@ struct tp_touch {
 	uint64_t millis;
 	int distance;				/* distance == 0 means touch */
 	int pressure;
-	int pressure_delta;
 
 	struct {
 		/* A quirk mostly used on Synaptics touchpads. In a

test/litest.c

@@ -1502,39 +1502,23 @@ litest_touch_move_extended(struct litest_device *d,
 }
 
 void
-litest_touch_move_to_extended(struct litest_device *d,
-			      unsigned int slot,
-			      double x_from, double y_from,
-			      double x_to, double y_to,
-			      struct axis_replacement *axes,
-			      int steps, int sleep_ms)
+litest_touch_move_to(struct litest_device *d,
+		     unsigned int slot,
+		     double x_from, double y_from,
+		     double x_to, double y_to,
+		     int steps, int sleep_ms)
 {
 	for (int i = 0; i < steps - 1; i++) {
-		litest_touch_move_extended(d, slot,
-					   x_from + (x_to - x_from)/steps * i,
-					   y_from + (y_to - y_from)/steps * i,
-					   axes);
+		litest_touch_move(d, slot,
+				  x_from + (x_to - x_from)/steps * i,
+				  y_from + (y_to - y_from)/steps * i);
 		if (sleep_ms) {
 			libinput_dispatch(d->libinput);
 			msleep(sleep_ms);
 			libinput_dispatch(d->libinput);
 		}
 	}
-	litest_touch_move_extended(d, slot, x_to, y_to, axes);
-}
-
-void
-litest_touch_move_to(struct litest_device *d,
-		     unsigned int slot,
-		     double x_from, double y_from,
-		     double x_to, double y_to,
-		     int steps, int sleep_ms)
-{
-	litest_touch_move_to_extended(d, slot,
-				      x_from, y_from,
-				      x_to, y_to,
-				      NULL,
-				      steps, sleep_ms);
+	litest_touch_move(d, slot, x_to, y_to);
 }
 
 static int

test/litest.h

@@ -411,13 +411,6 @@ litest_touch_move_to(struct litest_device *d,
 		     double x_from, double y_from,
 		     double x_to, double y_to,
 		     int steps, int sleep_ms);
-void
-litest_touch_move_to_extended(struct litest_device *d,
-			      unsigned int slot,
-			      double x_from, double y_from,
-			      double x_to, double y_to,
-			      struct axis_replacement *axes,
-			      int steps, int sleep_ms);
 
 void
 litest_touch_move_two_touches(struct litest_device *d,

test/touchpad.c

@@ -3650,7 +3650,7 @@ START_TEST(touchpad_thumb_edgescroll)
 	libinput_dispatch(li);
 	litest_assert_only_typed_events(li, LIBINPUT_EVENT_POINTER_AXIS);
 
-	litest_touch_move_to_extended(dev, 0, 99, 55, 99, 70, axes, 10, 0);
+	litest_touch_move_to(dev, 0, 99, 55, 99, 70, 10, 0);
 
 	litest_assert_only_typed_events(li, LIBINPUT_EVENT_POINTER_AXIS);
 }