From 8a847992137e9da5922f12d9f70273e65d77fe8d Mon Sep 17 00:00:00 2001
From: Tuukka Lehtonen <tuukka.lehtonen@semantum.fi>
Date: Wed, 30 Nov 2016 14:57:40 +0200
Subject: [PATCH] Fixed regression in TrendNode.

The regression was caused by change r32901 and merge r32981. The problem
was that the code tried to keep existing VertRuler nodes alive as much
as possible to keep their (transient) settings in place between chart
configuration reloads. However the code failed to do this correctly and
caused IndexOutOfBoundsExceptions and other corollary failures.

This fix needs to go into platform branches 1.22.2 and 1.22 as well.

refs #6547
[PRIVATE-11736]

Change-Id: Idb7d9d77b1a6b0bf513a5829b4c373cde9747529
---
 .../src/org/simantics/trend/impl/TrendNode.java | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/bundles/org.simantics.trend/src/org/simantics/trend/impl/TrendNode.java b/bundles/org.simantics.trend/src/org/simantics/trend/impl/TrendNode.java
index 1d19e2f17..304b73c43 100644
--- a/bundles/org.simantics.trend/src/org/simantics/trend/impl/TrendNode.java
+++ b/bundles/org.simantics.trend/src/org/simantics/trend/impl/TrendNode.java
@@ -60,7 +60,6 @@ import org.simantics.utils.format.ValueFormat;
 
 import gnu.trove.map.TObjectIntMap;
 import gnu.trove.map.hash.TObjectIntHashMap;
-import gnu.trove.procedure.TIntProcedure;
 import gnu.trove.procedure.TObjectProcedure;
 
 public class TrendNode extends G2DParentNode implements TrendLayout {
@@ -276,7 +275,6 @@ public class TrendNode extends G2DParentNode implements TrendLayout {
 
 		TObjectIntMap<String> newItemMap = itemIndexMap(newSpec.items);
 		TObjectIntMap<String> currentItemMap = itemIndexMap(spec.items);
-		TObjectIntMap<String> addedItemMap = subtract(newItemMap, currentItemMap);
 		TObjectIntMap<String> removedItemMap = subtract(currentItemMap, newItemMap);
 		Map<String, VertRuler> existingRulers = new HashMap<>();
 		if (this.spec.axisMode == YAxisMode.MultiAxis) {
@@ -347,6 +345,9 @@ public class TrendNode extends G2DParentNode implements TrendLayout {
 				for (int i=0; i<analogItems.size(); i++)
 					vertRulers.add( addNode(VertRuler.class) );
 			} else {
+				// Remove rulers of the items that were removed
+				// and add new rulers to have enough of them for
+				// each separate analog signal.
 				removedItemMap.forEachKey(new TObjectProcedure<String>() {
 					@Override
 					public boolean execute(String id) {
@@ -358,13 +359,11 @@ public class TrendNode extends G2DParentNode implements TrendLayout {
 						return true;
 					}
 				});
-				addedItemMap.forEachValue(new TIntProcedure() {
-					@Override
-					public boolean execute(int index) {
-						vertRulers.add( index, addNode(VertRuler.class) );
-						return true;
-					}
-				});
+				// Ensure TODO: validate that this works also for keeping ruler settings 
+				for (int i = vertRulers.size(); i < analogItems.size(); ++i) {
+					VertRuler ruler = addNode(VertRuler.class);
+					vertRulers.add(ruler);
+				}
 			}
 
 			for (int i = 0; i < analogItems.size(); i++) {
-- 
2.47.1