fix [#25778] Memoryblock Data from SCR: end corrupt

+ other minor changes.

source/blender/blenloader/intern/readfile.c

@@ -5279,7 +5279,11 @@ static void direct_link_screen(FileData *fd, bScreen *sc)
 				for(cl= sconsole->history.first; cl; cl= cl_next) {
 					cl_next= cl->next;
 					cl->line= newdataadr(fd, cl->line);
-					if (cl->line == NULL) {
+					if (cl->line) {
+						/* the allocted length is not written, so reset here */
+						cl->len_alloc= cl->len + 1;
+					}
+					else {
 						BLI_remlink(&sconsole->history, cl);
 						MEM_freeN(cl);
 					}

source/blender/blenloader/intern/writefile.c

@@ -2139,6 +2139,7 @@ static void write_screens(WriteData *wd, ListBase *scrbase)
 					ConsoleLine *cl;
 
 					for (cl=con->history.first; cl; cl=cl->next) {
+						/* 'len_alloc' is invalid on write, set from 'len' on read */
 						writestruct(wd, DATA, "ConsoleLine", 1, cl);
 						writedata(wd, DATA, cl->len+1, cl->line);
 					}

source/blender/python/intern/bpy_rna.c

@@ -1071,7 +1071,6 @@ static int pyrna_py_to_prop(PointerRNA *ptr, PropertyRNA *prop, void *data, PyOb
 		case PROP_STRING:
 		{
 			const char *param;
-			Py_ssize_t param_size= 0;
 #ifdef USE_STRING_COERCE
 			PyObject *value_coerce= NULL;
 			int subtype= RNA_property_subtype(prop);
@@ -1080,10 +1079,10 @@ static int pyrna_py_to_prop(PointerRNA *ptr, PropertyRNA *prop, void *data, PyOb
 				param= PyC_UnicodeAsByte(value, &value_coerce);
 			}
 			else {
-				param= _PyUnicode_AsStringAndSize(value, &param_size);
+				param= _PyUnicode_AsString(value);
 			}
 #else // USE_STRING_COERCE
-			param= _PyUnicode_AsStringAndSize(value, &param_size);
+			param= _PyUnicode_AsStringSize(value);
 #endif // USE_STRING_COERCE
 
 			if (param==NULL) {

source/tests/pep8.py

@@ -48,6 +48,8 @@ def file_list_py(path):
 
 def is_pep8(path):
     print(path)
+    if open(path, 'rb').read(3) == b'\xef\xbb\xbf':
+        print("\nfile contains BOM, remove first 3 bytes: %r\n" % path)
     f = open(path, 'r', encoding="utf8")
     for i in range(PEP8_SEEK_COMMENT):
         line = f.readline()