Also add the new x_diff_sort array to the other SPH particle types.

src/hydro/Default/hydro_part.h

@@ -27,6 +27,9 @@ struct xpart {
   /* Offset between current position and position at last tree rebuild. */
   float x_diff[3];
 
+  /*! Offset between the current position and position at the last sort. */
+  float x_diff_sort[3];
+
   /* Velocity at the last full step. */
   float v_full[3];
 

src/hydro/Gizmo/hydro_part.h

@@ -27,6 +27,9 @@ struct xpart {
   /* Offset between current position and position at last tree rebuild. */
   float x_diff[3];
 
+  /* Offset between the current position and position at the last sort. */
+  float x_diff_sort[3];
+
   /* Velocity at the last full step. */
   float v_full[3];
 

src/hydro/Minimal/hydro_part.h

@@ -46,6 +46,9 @@ struct xpart {
   /*! Offset between current position and position at last tree rebuild. */
   float x_diff[3];
 
+  /*! Offset between the current position and position at the last sort. */
+  float x_diff_sort[3];
+
   /*! Velocity at the last full step. */
   float v_full[3];
 

src/hydro/PressureEntropy/hydro_part.h

@@ -38,6 +38,9 @@ struct xpart {
   /*! Offset between current position and position at last tree rebuild. */
   float x_diff[3];
 
+  /*! Offset between the current position and position at the last sort. */
+  float x_diff_sort[3];
+
   /*! Velocity at the last full step. */
   float v_full[3];
 

src/hydro/Shadowswift/hydro_part.h

@@ -28,6 +28,9 @@ struct xpart {
   /* Offset between current position and position at last tree rebuild. */
   float x_diff[3];
 
+  /*! Offset between the current position and position at the last sort. */
+  float x_diff_sort[3];
+
   /* Velocity at the last full step. */
   float v_full[3];