- added undo pushes for buttons invoking file window in scene buttons

(set directory, backbuf, scene)
- small annoyance; after extrude the transform() didn't react to the
  "midtog" feature (middlemouse constraint)

source/blender/src/buttons_scene.c

@@ -435,6 +435,7 @@ static void output_pic(char *name)
 {
 	strcpy(G.scene->r.pic, name);
 	allqueue(REDRAWBUTSSCENE, 0);
+	BIF_undo_push("Change output picture directory");
 }
 
 static void backbuf_pic(char *name)
@@ -449,6 +450,7 @@ static void backbuf_pic(char *name)
 		free_image_buffers(ima);	/* force read again */
 		ima->ok= 1;
 	}
+	BIF_undo_push("Change background picture");
 }
 
 static void ftype_pic(char *name)
@@ -464,6 +466,7 @@ static void scene_change_set(Scene *sc, Scene *set) {
 		
 		allqueue(REDRAWBUTSSCENE, 0);
 		allqueue(REDRAWVIEW3D, 0);
+		BIF_undo_push("Change set Scene");
 	}
 }
 
@@ -789,7 +792,6 @@ void do_render_panels(unsigned short event)
 		break;
 	case B_CLEARSET:
 		scene_change_set(G.scene, NULL);
-		BIF_undo_push("Clear set");
 		break;
 	}
 }

source/blender/src/editobject.c

@@ -6211,6 +6211,7 @@ void transform(int mode)
 						if(cameragrab) {
 							dvec[0]= dvec[1]= dvec[2]= 0.0;
 						}
+						if(mode == 'n') mode= 'g';
 					}
 					else
 						axismode = 0;