config manager: throttle config saves to file

When the default config is applied it queues a lot of saves to disk that
are unnecessary

runelite-client/src/main/java/net/runelite/client/config/ConfigManager.java

@@ -99,6 +99,9 @@ public class ConfigManager
 
 	public final void switchSession(AccountSession session)
 	{
+		// Ensure existing config is saved
+		sendConfig();
+
 		if (session == null)
 		{
 			this.session = null;
@@ -315,7 +318,7 @@ public class ConfigManager
 		}
 	}
 
-	private synchronized void saveToFile(final File propertiesFile) throws IOException
+	private void saveToFile(final File propertiesFile) throws IOException
 	{
 		propertiesFile.getParentFile().mkdirs();
 
@@ -392,19 +395,6 @@ public class ConfigManager
 			pendingChanges.put(groupName + "." + key, value);
 		}
 
-		Runnable task = () ->
-		{
-			try
-			{
-				saveToFile(propertiesFile);
-			}
-			catch (IOException ex)
-			{
-				log.warn("unable to save configuration file", ex);
-			}
-		};
-		executor.execute(task);
-
 		ConfigChanged configChanged = new ConfigChanged();
 		configChanged.setGroup(groupName);
 		configChanged.setKey(key);
@@ -435,19 +425,6 @@ public class ConfigManager
 			pendingChanges.put(groupName + "." + key, null);
 		}
 
-		Runnable task = () ->
-		{
-			try
-			{
-				saveToFile(propertiesFile);
-			}
-			catch (IOException ex)
-			{
-				log.warn("unable to save configuration file", ex);
-			}
-		};
-		executor.execute(task);
-
 		ConfigChanged configChanged = new ConfigChanged();
 		configChanged.setGroup(groupName);
 		configChanged.setKey(key);
@@ -653,6 +630,7 @@ public class ConfigManager
 
 	public void sendConfig()
 	{
+		boolean changed;
 		synchronized (pendingChanges)
 		{
 			if (client != null)
@@ -672,7 +650,20 @@ public class ConfigManager
 					}
 				}
 			}
+			changed = !pendingChanges.isEmpty();
 			pendingChanges.clear();
 		}
+
+		if (changed)
+		{
+			try
+			{
+				saveToFile(propertiesFile);
+			}
+			catch (IOException ex)
+			{
+				log.warn("unable to save configuration file", ex);
+			}
+		}
 	}
 }