Merged changes in the trunk up to revision 51126.

Conflicts resolved:
source/blender/blenloader/intern/readfile.c
source/blender/windowmanager/WM_types.h

source/blender/python/bmesh/bmesh_py_types.c

@@ -1808,7 +1808,7 @@ static PyObject *bpy_bmfaceseq_new(BPy_BMElemSeq *self, PyObject *args)
 
 		f_new = BM_face_create(bm, vert_array, edge_array, vert_seq_len, FALSE);
 
-		if (f_new == NULL) {
+		if (UNLIKELY(f_new == NULL)) {
 			PyErr_SetString(PyExc_ValueError,
 			                "faces.new(verts): couldn't create the new face, internal error");
 			goto cleanup;

source/blender/python/bmesh/bmesh_py_types_customdata.c

@@ -1079,7 +1079,7 @@ int BPy_BMLayerItem_SetItem(BPy_BMElem *py_ele, BPy_BMLayerItem *py_layer, PyObj
 				ret = -1;
 			}
 			else {
-				BLI_strncpy(mstring->s, tmp_val, sizeof(mstring->s));
+				BLI_strncpy(mstring->s, tmp_val, MIN2(PyBytes_Size(py_value), sizeof(mstring->s)));
 			}
 			break;
 		}

source/blender/python/generic/py_capi_utils.c

@@ -760,7 +760,6 @@ int PyC_FlagSet_ValueFromID(PyC_FlagSet *item, const char *identifier, int *valu
 	return 0;
 }
 
-/* 'value' _must_ be a set type, error check before calling */
 int PyC_FlagSet_ToBitfield(PyC_FlagSet *items, PyObject *value, int *r_value, const char *error_prefix)
 {
 	/* set of enum items, concatenate all values with OR */
@@ -771,6 +770,13 @@ int PyC_FlagSet_ToBitfield(PyC_FlagSet *items, PyObject *value, int *r_value, co
 	Py_ssize_t hash = 0;
 	PyObject *key;
 
+	if (!PySet_Check(value)) {
+		PyErr_Format(PyExc_TypeError,
+		             "%.200s expected a set, not %.200s",
+		             error_prefix, Py_TYPE(value)->tp_name);
+		return -1;
+	}
+
 	*r_value = 0;
 
 	while (_PySet_NextEntry(value, &pos, &key, &hash)) {
@@ -778,7 +784,7 @@ int PyC_FlagSet_ToBitfield(PyC_FlagSet *items, PyObject *value, int *r_value, co
 
 		if (param == NULL) {
 			PyErr_Format(PyExc_TypeError,
-			             "%.200s expected a string, not %.200s",
+			             "%.200s set must contain strings, not %.200s",
 			             error_prefix, Py_TYPE(key)->tp_name);
 			return -1;
 		}

source/blender/python/intern/bpy_interface.c

@@ -251,6 +251,10 @@ void BPY_python_start(int argc, const char **argv)
 	 * an error, this is highly annoying, another stumbling block for devs,
 	 * so use a more relaxed error handler and enforce utf-8 since the rest of
 	 * blender is utf-8 too - campbell */
+
+	/* XXX, update: this is unreliable! 'PYTHONIOENCODING' is ignored in MS-Windows
+	 * when dynamically linked, see: [#31555] for details.
+	 * Python doesn't expose a good way to set this. */
 	BLI_setenv("PYTHONIOENCODING", "utf-8:surrogateescape");
 
 	/* Python 3.2 now looks for '2.xx/python/include/python3.2d/pyconfig.h' to
@@ -264,15 +268,6 @@ void BPY_python_start(int argc, const char **argv)
 
 	Py_Initialize();
 
-#ifdef WIN32
-	/* this is disappointing, its likely a bug in python?
-	 * for some reason 'PYTHONIOENCODING' is ignored in windows
-	 * see: [#31555] for details. */
-	PyRun_SimpleString("import sys, io\n"
-	                   "sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='surrogateescape', line_buffering=True)\n"
-	                   "sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding='utf-8', errors='surrogateescape', line_buffering=True)\n");
-#endif  /* WIN32 */
-
 	// PySys_SetArgv(argc, argv); // broken in py3, not a huge deal
 	/* sigh, why do python guys not have a (char **) version anymore? */
 	{
@@ -678,6 +673,11 @@ void BPY_modules_load_user(bContext *C)
 				else {
 					Py_DECREF(module);
 				}
+
+				/* check if the script loaded a new file */
+				if (bmain != CTX_data_main(C)) {
+					break;
+				}
 			}
 		}
 	}