Add more logging

Author: da-phil

src/gui/gtk.c

@@ -773,6 +773,18 @@ static gboolean _scrolled(GtkWidget *widget,
   (void)user_data;
   GdkDevice *device = gdk_event_get_source_device((GdkEvent *)event);
 
+  dt_print(DT_DEBUG_INPUT,
+           "[scroll] direction=%d smooth=%s stop=%s ctrl=%s"
+           " x=%.1f y=%.1f dx=%.3f dy=%.3f state=0x%x"
+           " device='%s' source-type=%d",
+           event->direction,
+           event->direction == GDK_SCROLL_SMOOTH ? "yes" : "no",
+           event->is_stop ? "yes" : "no",
+           dt_modifier_is(event->state, GDK_CONTROL_MASK) ? "yes" : "no",
+           event->x, event->y, event->delta_x, event->delta_y, event->state,
+           device ? gdk_device_get_name(device) : "<none>",
+           device ? (int)gdk_device_get_source(device) : -1);
+
   const gboolean ctrl_held = dt_modifier_is(event->state, GDK_CONTROL_MASK);
   const gboolean is_touchpad_source = device && gdk_device_get_source(device) == GDK_SOURCE_TOUCHPAD;
   const gboolean is_known_gesture_device = (device == _touchpad);