revert fix for 402 quota usage

Author: xinyi-gong

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/ChatContentViewer.java

@@ -217,17 +217,11 @@ public void processTurnEvent(ChatProgressValue value) {
         errMsg = Messages.chat_model_unsupported_message;
       }
       if (StringUtils.isNotEmpty(errMsg)) {
-        // Check once whether we're already on the fallback model
-        CopilotModel fallback = this.serviceManager.getModelService().getFallbackModel();
-        CopilotModel current = this.serviceManager.getModelService().getActiveModel();
-        boolean alreadyOnFallback = fallback != null && current != null
-            && fallback.getModelName().equals(current.getModelName());
-
-        // Only replace the error message with "switched to fallback" when we're NOT already
-        // on the fallback model. When already on fallback, show the original CLS message.
-        if (value.getCode() == 402 && !alreadyOnFallback) {
+        // TODO: remove this error message replacement if statement when the CLS side warn message is aligned.
+        if (value.getCode() == 402) {
           CopilotPlan userPlan = this.serviceManager.getAuthStatusManager().getQuotaStatus().copilotPlan();
-          String fallbackModelName = fallback != null ? fallback.getModelName()
+          CopilotModel fallbackModel = this.serviceManager.getModelService().getFallbackModel();
+          String fallbackModelName = fallbackModel != null ? fallbackModel.getModelName()
               : Messages.chat_noQuotaView_fallbackModel;
 
           if (MenuUtils.isCfiPlan(userPlan)) {
@@ -241,19 +235,15 @@ public void processTurnEvent(ChatProgressValue value) {
 
         renderWarnMessageWithUpgradePlanButton(errMsg, value.getCode());
 
-        // Switch to fallback model and auto-retry, but only if not already on the fallback model
-        // to avoid an infinite loop of 402 → switch → resend → 402 → ...
-        if (value.getCode() == 402 && !alreadyOnFallback
+        if (value.getCode() == 402
             && this.serviceManager.getAuthStatusManager().getQuotaStatus().copilotPlan() != CopilotPlan.free) {
           this.serviceManager.getModelService().setFallBackModelAsActiveModel();
           this.serviceManager.getAuthStatusManager().checkQuota();
 
-          String previousInput =
-              this.serviceManager.getUserPreferenceService().getPreviousInput(StringUtils.EMPTY);
+          String previousInput = this.serviceManager.getUserPreferenceService().getPreviousInput(StringUtils.EMPTY);
           if (StringUtils.isNotEmpty(previousInput)) {
             IEventBroker eventBroker = PlatformUI.getWorkbench().getService(IEventBroker.class);
-            Map<String, Object> properties =
-                Map.of("previousInput", previousInput, "needCreateUserTurn", false);
+            Map<String, Object> properties = Map.of("previousInput", previousInput, "needCreateUserTurn", false);
             eventBroker.post(CopilotEventConstants.TOPIC_CHAT_ON_SEND, properties);
           }
         }

com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/CopilotTurnWidget.java

@@ -25,9 +25,6 @@
  * A custom widget that displays a turn for the copilot.
  */
 public class CopilotTurnWidget extends BaseTurnWidget {
-
-  private Label modelInfoLabel;
-
   /**
    * Create the widget.
    */
@@ -74,11 +71,8 @@ public void renderModelInfo(String modelName, double billingMultiplier) {
         if (footer == null || footer.isDisposed()) {
           createFooter();
         }
-        if (modelInfoLabel != null && !modelInfoLabel.isDisposed()) {
-          modelInfoLabel.dispose();
-        }
         if (StringUtils.isNotBlank(modelName)) {
-          modelInfoLabel = new Label(footer, SWT.NONE);
+          Label modelInfoLabel = new Label(footer, SWT.NONE);
           // When token-based billing is enabled on the language server, the per-turn billing
           // multiplier is no longer a meaningful price signal, so render the model name on its
           // own. Fall back to the legacy "{model} - {multiplier}" format otherwise.
@@ -97,9 +91,6 @@ public void renderModelInfo(String modelName, double billingMultiplier) {
           modelInfoLabel.setLayoutData(labelGridData);
           modelInfoLabel.setData(CssConstants.CSS_CLASS_NAME_KEY, "model-info-label");
 
-          // Ensure footer stays at the bottom of the turn widget, even when
-          // warn widgets are appended after it (e.g. quota fallback retry).
-          footer.moveBelow(null);
           footer.requestLayout();
         }
       }, this);