add id property clear function (matching the same python function for dicts/lists)

intern/cycles/blender/addon/__init__.py

@@ -21,7 +21,7 @@
 bl_info = {
     "name": "Cycles Render Engine",
     "author": "",
-    "blender": (2, 6, 5),
+    "blender": (2, 60, 5),
     "location": "Info header, render engine menu",
     "description": "Cycles Render Engine integration",
     "warning": "",

source/blender/blenkernel/BKE_idprop.h

@@ -315,6 +315,8 @@ __attribute__((nonnull))
  * the actual struct IDProperty struct either.*/
 void IDP_FreeProperty(struct IDProperty *prop);
 
+void IDP_ClearProperty(IDProperty *prop);
+
 /** Unlinks any struct IDProperty<->ID linkage that might be going on.*/
 void IDP_UnlinkProperty(struct IDProperty *prop);
 

source/blender/blenkernel/intern/idprop.c

@@ -815,6 +815,13 @@ void IDP_FreeProperty(IDProperty *prop)
 	}
 }
 
+void IDP_ClearProperty(IDProperty *prop)
+{
+	IDP_FreeProperty(prop);
+	prop->data.pointer = NULL;
+	prop->len = prop->totallen = 0;
+}
+
 /* Unlinks any IDProperty<->ID linkage that might be going on.
  * note: currently unused.*/
 void IDP_UnlinkProperty(IDProperty *prop)

source/blender/editors/space_sequencer/sequencer_edit.c

@@ -925,7 +925,7 @@ static void set_filter_seq(Scene *scene)
 			if (seq->type == SEQ_TYPE_MOVIE) {
 				seq->flag |= SEQ_FILTERY;
 				reload_sequence_new_file(scene, seq, FALSE);
-				calc_sequence(scene, seq);
+				BKE_sequence_calc(scene, seq);
 			}
 
 		}

source/blender/python/generic/idprop_py_api.c

@@ -836,6 +836,11 @@ static PyObject *BPy_IDGroup_to_dict(BPy_IDProperty *self)
 	return BPy_IDGroup_MapDataToPy(self->prop);
 }
 
+static PyObject *BPy_IDGroup_clear(BPy_IDProperty *self)
+{
+	IDP_ClearProperty(self->prop);
+	Py_RETURN_NONE;
+}
 
 /* Matches python dict.get(key, [default]) */
 static PyObject *BPy_IDGroup_Get(BPy_IDProperty *self, PyObject *args)
@@ -875,6 +880,8 @@ static struct PyMethodDef BPy_IDGroup_methods[] = {
 	 "idprop.get(k[,d]) -> idprop[k] if k in idprop, else d.  d defaults to None"},
 	{"to_dict", (PyCFunction)BPy_IDGroup_to_dict, METH_NOARGS,
 	 "return a purely python version of the group"},
+	{"clear", (PyCFunction)BPy_IDGroup_clear, METH_NOARGS,
+	 "clear all members from this group"},
 	{NULL, NULL, 0, NULL}
 };