[#21436] Do not set BASACT to NULL when new base wasn't created in convert_exec

by Sergey Sharybin (nazgul)

(from the patch)
When new base wasn't created in convert_exec() function. BASACT will set to NULL, which is not convenient. For example,
u can't enter edit mode after converting curve to mesh. Now BASACT changes only if base for active object was changed.

source/blender/editors/animation/anim_markers.c

@@ -819,7 +819,7 @@ static int ed_marker_select(bContext *C, wmEvent *evt, int extend, int camera)
 		Scene *scene= CTX_data_scene(C);
 		Base *base;
 		TimeMarker *marker;
-		int sel;
+		int sel= 0;
 
 		if (!extend)
 			scene_deselect_all(scene);

source/blender/editors/object/object_add.c

@@ -1348,9 +1348,6 @@ static int convert_exec(bContext *C, wmOperator *op)
 				}
 				
 				mball_to_mesh(&ob->disp, ob1->data);
-				
-				/* So we can see the wireframe */
-				BASACT= basen; // XXX hm
 			}
 			else
 				continue;
@@ -1362,7 +1359,9 @@ static int convert_exec(bContext *C, wmOperator *op)
 		if(basen) {
 			if(ob == obact) {
 				ED_base_object_activate(C, basen);
-				basact = basen;
+
+				/* store new active base to update BASACT */
+				basact= basen;
 			}
 
 			basen= NULL;
@@ -1382,12 +1381,13 @@ static int convert_exec(bContext *C, wmOperator *op)
 	if(!keep_original)
 		DAG_scene_sort(scene);
 
-	/* texspace and normals */
-	if(!basen) BASACT= NULL; // XXX base;
-
 // XXX	ED_object_enter_editmode(C, 0);
 // XXX	exit_editmode(C, EM_FREEDATA|EM_WAITCURSOR); /* freedata, but no undo */
-	BASACT= basact;
+
+	if (basact) {
+		/* active base was changed */
+		BASACT= basact;
+	}
 
 	DAG_scene_sort(scene);
 	WM_event_add_notifier(C, NC_SCENE|NC_OBJECT|ND_DRAW, scene); /* is NC_SCENE needed ? */