Read previous BTree modification count from the graph

Modification count is used when generating unique names for the
resources. We should continue from the previous modification count
whenever creating new BTree object to work on.

refs #7690

Change-Id: I446af8ad22157a1c64c984071ae6c36cae374935

diff --git a/bundles/org.simantics.datatypes/src/org/simantics/datatypes/utils/BTreeUtils.java b/bundles/org.simantics.datatypes/src/org/simantics/datatypes/utils/BTreeUtils.java
index 7d4f782a94d4e184f4916bd11514aec451e5900a..60ceba1b561da23ba77e0882b6f9af443a4c211a 100644 (file)
--- a/bundles/org.simantics.datatypes/src/org/simantics/datatypes/utils/BTreeUtils.java
+++ b/bundles/org.simantics.datatypes/src/org/simantics/datatypes/utils/BTreeUtils.java
@@ -380,7 +380,8 @@ final public class BTreeUtils implements BTreeContentManager {
                        this.ownerRelation = ownerRelation;
                        this.nodeType = nodeType != null ? nodeType : DATA.BTreeNode;
                        this.t = t;
-                       this.mod = 0;
+                       Long possibleMod = graph.getPossibleRelatedValue(tree, DATA.BTree_mod, Bindings.LONG);
+                       this.mod = possibleMod != null ? possibleMod : 0;
                        this.cached = cached;
                        if (cached) {
                                this.beans = new HashMap<Resource, BTreeContentBean>();