From 334bd2a926773a1c2fc2797db398df3a0760349d Mon Sep 17 00:00:00 2001
From: reuk <reuk@users.noreply.github.com>
Date: Tue, 3 Aug 2021 18:27:23 +0100
Subject: [PATCH] AUv3 Client:  Notify host when updating current program

---
 .../AU/juce_AUv3_Wrapper.mm                   | 33 ++++++++++++++++---
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm b/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm
index ae818a5daa..d67b3ca9e6 100644
--- a/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm
+++ b/modules/juce_audio_plugin_client/AU/juce_AUv3_Wrapper.mm
@@ -934,14 +934,39 @@ public:
     }
    #endif
 
+    struct ScopedKeyChange
+    {
+        ScopedKeyChange (AUAudioUnit* a, NSString* k)
+            : au (a), key (k)
+        {
+            [au willChangeValueForKey: key];
+        }
+
+        ~ScopedKeyChange()
+        {
+            [au didChangeValueForKey: key];
+        }
+
+        AUAudioUnit* au;
+        NSString* key;
+    };
+
     //==============================================================================
-    void audioProcessorChanged (AudioProcessor* processor, const ChangeDetails&) override
+    void audioProcessorChanged (AudioProcessor* processor, const ChangeDetails& details) override
     {
         ignoreUnused (processor);
 
-        [au willChangeValueForKey: @"allParameterValues"];
-        addPresets();
-        [au didChangeValueForKey: @"allParameterValues"];
+        if (! details.programChanged)
+            return;
+
+        {
+            ScopedKeyChange scope (au, @"allParameterValues");
+            addPresets();
+        }
+
+        {
+            ScopedKeyChange scope (au, @"currentPreset");
+        }
     }
 
     void audioProcessorParameterChanged (AudioProcessor*, int idx, float newValue) override