add option to select face by matching number of sides.

source/blender/bmesh/intern/bmesh_operators.h

@@ -51,6 +51,7 @@ enum {
 	SIMFACE_MATERIAL = 201,
 	SIMFACE_IMAGE,
 	SIMFACE_AREA,
+	SIMFACE_SIDES,
 	SIMFACE_PERIMETER,
 	SIMFACE_NORMAL,
 	SIMFACE_COPLANAR

source/blender/bmesh/operators/bmo_utils.c

@@ -542,7 +542,7 @@ void bmo_similar_faces_exec(BMesh *bm, BMOperator *op)
 	SimSel_FaceExt *f_ext = NULL;
 	int *indices = NULL;
 	float t_no[3];	/* temporary normal */
-	int type = BMO_slot_int_get(op, "type");
+	const int type = BMO_slot_int_get(op, "type");
 	const float thresh = BMO_slot_float_get(op, "thresh");
 	const float thresh_radians = thresh * (float)M_PI;
 
@@ -662,6 +662,13 @@ void bmo_similar_faces_exec(BMesh *bm, BMOperator *op)
 						}
 						break;
 
+					case SIMFACE_SIDES:
+						if (fm->len == fs->len) {
+							BMO_elem_flag_enable(bm, fm, FACE_MARK);
+							cont = FALSE;
+						}
+						break;
+
 					case SIMFACE_PERIMETER:
 						if (fabsf(f_ext[i].perim - f_ext[indices[idx]].perim) <= thresh) {
 							BMO_elem_flag_enable(bm, fm, FACE_MARK);

source/blender/editors/mesh/editmesh_select.c

@@ -690,6 +690,7 @@ static EnumPropertyItem prop_similar_types[] = {
 	{SIMFACE_MATERIAL, "MATERIAL", 0, "Material", ""},
 	{SIMFACE_IMAGE, "IMAGE", 0, "Image", ""},
 	{SIMFACE_AREA, "AREA", 0, "Area", ""},
+	{SIMFACE_SIDES, "SIDES", 0, "Polygon Sides", ""},
 	{SIMFACE_PERIMETER, "PERIMETER", 0, "Perimeter", ""},
 	{SIMFACE_NORMAL, "NORMAL", 0, "Normal", ""},
 	{SIMFACE_COPLANAR, "COPLANAR", 0, "Co-planar", ""},