http-api: Use observeOn to run code on the ClientThread

runelite-client/src/main/java/net/runelite/client/plugins/chatcommands/ChatCommandsPlugin.java

@@ -828,9 +828,9 @@ public class ChatCommandsPlugin extends Plugin
 			ItemPrice item = retrieveFromList(results, search);
 			CLIENT.lookupItem(item.getId())
 				.subscribeOn(Schedulers.io())
+				.observeOn(Schedulers.from(clientThread))
 				.subscribe(
 					(osbresult) ->
-						clientThread.invoke(() ->
 					{
 						int itemId = item.getId();
 						int itemPrice = itemManager.getItemPrice(itemId);
@@ -865,7 +865,7 @@ public class ChatCommandsPlugin extends Plugin
 						messageNode.setRuneLiteFormatMessage(response);
 						chatMessageManager.update(messageNode);
 						client.refreshChat();
-						})
+					}
 				);
 		}
 	}

runelite-client/src/main/java/net/runelite/client/plugins/examine/ExaminePlugin.java

@@ -371,9 +371,9 @@ public class ExaminePlugin extends Plugin
 				int finalQuantity = quantity;
 				CLIENT.lookupItem(id)
 					.subscribeOn(Schedulers.io())
+					.observeOn(Schedulers.from(clientThread))
 					.subscribe(
 						(osbresult) ->
-							clientThread.invoke(() ->
 						{
 							message
 								.append(ChatColorType.NORMAL)
@@ -400,7 +400,7 @@ public class ExaminePlugin extends Plugin
 									.append(ChatColorType.NORMAL)
 									.append("ea)");
 							}
-							}),
+						},
 						(e) -> log.error(e.toString())
 					);
 			}

runelite-client/src/main/java/net/runelite/client/plugins/grandexchange/GrandExchangePlugin.java

@@ -552,13 +552,13 @@ public class GrandExchangePlugin extends Plugin
 
 			CLIENT.lookupItem(itemId)
 				.subscribeOn(Schedulers.io())
+				.observeOn(Schedulers.from(clientThread))
 				.subscribe(
 					(osbresult) ->
-						clientThread.invoke(() ->
 					{
 						final String text = geText.getText() + OSB_GE_TEXT + StackFormatter.formatNumber(osbresult.getOverall_average());
 						geText.setText(text);
-						}),
+					},
 					(e) -> log.debug("Error getting price of item {}", itemId, e)
 				);
 		});