From 732f487ab807af19f1b7d1e7164f5d9ed445c735 Mon Sep 17 00:00:00 2001
From: Leon Mak <leon@kaliberlabs.com>
Date: Mon, 26 Mar 2018 18:51:40 -0700
Subject: [PATCH 1/2] Fix cannot delete regions

---
 src/plugins/regions.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/plugins/regions.js b/src/plugins/regions.js
index 771f186..655cbb7 100644
--- a/src/plugins/regions.js
+++ b/src/plugins/regions.js
@@ -58,7 +58,7 @@ class Regions extends Component {
     }
 
     // cache reference to old regions
-    const oldRegions = Object.create(this.props.wavesurfer.regions.list);
+    const oldRegions = Object.assign({}, this.props.wavesurfer.regions.list);
     let newRegionId;
     let oldRegionId;
 

From 5082f1c5ca451beb19e83848535732cd087ee9f4 Mon Sep 17 00:00:00 2001
From: Leon Mak <leonmak@users.noreply.github.com>
Date: Tue, 27 Mar 2018 14:15:08 -0700
Subject: [PATCH 2/2] Update regions.js

remove old region after updating
---
 src/plugins/regions.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/plugins/regions.js b/src/plugins/regions.js
index 655cbb7..271cdbe 100644
--- a/src/plugins/regions.js
+++ b/src/plugins/regions.js
@@ -66,9 +66,6 @@ class Regions extends Component {
       if ({}.hasOwnProperty.call(nextProps.regions, newRegionId)) {
         const newRegion = nextProps.regions[newRegionId];
 
-        // remove from oldRegions
-        delete oldRegions[newRegionId];
-
         // new regions
         if (!this.props.wavesurfer.regions.list[newRegionId]) {
           this._hookUpRegionEvents(nextProps.wavesurfer.addRegion(newRegion));
@@ -84,6 +81,9 @@ class Regions extends Component {
             end: newRegion.end
           });
         }
+        
+        // remove from oldRegions
+        delete oldRegions[newRegionId];
       }
     }