BPy: Mathutils fix: bug #3737

Vector.resize4D() didn't put 1 in the 4th component (the scale factor), as it did in 2.37.
While this is more "correct", it is much less usefull. Also, matrix.resize4x4 puts a 1 there too,
so might as well revert and be consistent.

source/blender/python/api2_2x/doc/Mathutils.py

@@ -493,6 +493,7 @@ class Vector:
   def resize4D():
     """
     Resize the vector to 4d. New axis will be 0.0.
+    The last component will be 1.0, to make multiplying 3d vectors by 4x4 matrices easier.
     @return: a copy of itself
     """
 

source/blender/python/api2_2x/vector.c

@@ -160,9 +160,9 @@ PyObject *Vector_Resize4D(VectorObject * self)
 	self->vec = self->data.py_data;  //force
 	if(self->size == 2){
 		self->data.py_data[2] = 0.0f;
-		self->data.py_data[3] = 0.0f;
+		self->data.py_data[3] = 1.0f;
 	}else if(self->size == 3){
-		self->data.py_data[3] = 0.0f;
+		self->data.py_data[3] = 1.0f;
 	}
 	self->size = 4;
 	return EXPP_incr_ret((PyObject*)self);