From e55355695e2767eae66b9a48c7306bb01d6142fa Mon Sep 17 00:00:00 2001
From: Matthew O'Connor <matthewoconnor@hotmail.co.uk>
Date: Sat, 14 Nov 2020 10:21:57 +0000
Subject: [PATCH] disallow duplicate splitivew panels (identical ids)

---
 packages/splitview/src/splitview/componentSplitview.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/packages/splitview/src/splitview/componentSplitview.ts b/packages/splitview/src/splitview/componentSplitview.ts
index 3e0bc2429..517de9208 100644
--- a/packages/splitview/src/splitview/componentSplitview.ts
+++ b/packages/splitview/src/splitview/componentSplitview.ts
@@ -161,6 +161,10 @@ export class ComponentSplitview
     }
 
     addPanel(options: AddSplitviewComponentOptions): void {
+        if (this.panels.has(options.id)) {
+            throw new Error(`panel ${options.id} already exists`);
+        }
+
         const view = createComponent(
             options.id,
             options.component,
@@ -259,6 +263,10 @@ export class ComponentSplitview
                 views: views.map((view) => {
                     const data = view.data;
 
+                    if (this.panels.has(data.id)) {
+                        throw new Error(`panel ${data.id} already exists`);
+                    }
+
                     const panel = createComponent(
                         data.id,
                         data.component,