Modified PluginListComponent so that if all paths to scan are deleted, it reverts to the default set of paths for the given format (otherwise there was no way to make it reset to default)

modules/juce_audio_processors/scanning/juce_PluginListComponent.cpp

@@ -328,14 +328,23 @@ void PluginListComponent::filesDropped (const StringArray& files, int, int)
 
 FileSearchPath PluginListComponent::getLastSearchPath (PropertiesFile& properties, AudioPluginFormat& format)
 {
-    return FileSearchPath (properties.getValue ("lastPluginScanPath_" + format.getName(),
-                                                format.getDefaultLocationsToSearch().toString()));
+    auto key = "lastPluginScanPath_" + format.getName();
+
+    if (properties.containsKey (key) && properties.getValue (key, {}).trim().isEmpty())
+        properties.removeValue (key);
+
+    return FileSearchPath (properties.getValue (key, format.getDefaultLocationsToSearch().toString()));
 }
 
 void PluginListComponent::setLastSearchPath (PropertiesFile& properties, AudioPluginFormat& format,
                                              const FileSearchPath& newPath)
 {
-    properties.setValue ("lastPluginScanPath_" + format.getName(), newPath.toString());
+    auto key = "lastPluginScanPath_" + format.getName();
+
+    if (newPath.getNumPaths() == 0)
+        properties.removeValue (key);
+    else
+        properties.setValue (key, newPath.toString());
 }
 
 //==============================================================================