From 40db0d6f6fca02e113c8aeeb7b34ace41fc765ae Mon Sep 17 00:00:00 2001
From: Matt Irvine <mji7wb@virginia.edu>
Date: Tue, 22 May 2018 13:06:00 -0700
Subject: [PATCH] Only allow model view components to be added once (#1458)

---
 src/sql/parts/modelComponents/componentBase.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/sql/parts/modelComponents/componentBase.ts b/src/sql/parts/modelComponents/componentBase.ts
index f89e8fe182..66972bfd40 100644
--- a/src/sql/parts/modelComponents/componentBase.ts
+++ b/src/sql/parts/modelComponents/componentBase.ts
@@ -156,6 +156,9 @@ export abstract class ContainerBase<T> extends ComponentBase {
 
 	/// IComponent container-related implementation
 	public addToContainer(componentDescriptor: IComponentDescriptor, config: any): void {
+		if (this.items.some(item => item.descriptor.id === componentDescriptor.id && item.descriptor.type === componentDescriptor.type)) {
+			return;
+		}
 		this.items.push(new ItemDescriptor(componentDescriptor, config));
 		this.modelStore.eventuallyRunOnComponent(componentDescriptor.id, component => component.registerEventHandler(event => {
 			if (event.eventType === ComponentEventType.validityChanged) {