Bugfix #3471

- Editmode Mesh: after a split command, normals were not recalculated

ALso: in Particle buttons, made the "Tex" button go to the maximum of 10
channels.

source/blender/src/editmesh_tools.c

@@ -646,6 +646,7 @@ void split_mesh(void)
 	adduplicateflag(SELECT);
 	/* old faces have flag 128 set, delete them */
 	delfaceflag(128);
+	recalc_editnormals();
 
 	waitcursor(0);