[516363] Tweak model change triggers priority to get validation

Make sure the LiveValidation trigger is executed after all the others
which are modifying the models but *BEFORE* Sirius's refresh by using
negative priorities

Bug: 516363
Change-Id: Idd2c7bd8a229c164f31d2ecce5837708d9395d5e

org.eclipse.emf.ecoretools.design/src/org/eclipse/emf/ecoretools/design/service/GenModelAutoReload.java

diff --git a/org.eclipse.emf.ecoretools.design/src/org/eclipse/emf/ecoretools/design/service/GenModelAutoReload.java b/org.eclipse.emf.ecoretools.design/src/org/eclipse/emf/ecoretools/design/service/GenModelAutoReload.java
index 56fdf07..3860b05 100644
--- a/org.eclipse.emf.ecoretools.design/src/org/eclipse/emf/ecoretools/design/service/GenModelAutoReload.java
+++ b/org.eclipse.emf.ecoretools.design/src/org/eclipse/emf/ecoretools/design/service/GenModelAutoReload.java
@@ -85,7 +85,7 @@
 
 	public static final NotificationFilter SHOULD_RELOAD = IS_TOUCH.negated().and(IS_ECORE.and(IS_ATTACHMENT));
 
-	public static final int PRIORITY = 0;
+	public static final int PRIORITY = -2;
 
 	public Option<Command> localChangesAboutToCommit(Collection<Notification> notifications) {
 		final Collection<GenModel> genModels = Lists.newArrayList();