feat(ui): enable "TerminalBuffer" mode to solve flicker (#24512)

packages/core/src/config/config.ts

@@ -648,6 +648,8 @@ export interface ConfigParameters {
   trustedFolder?: boolean;
   useBackgroundColor?: boolean;
   useAlternateBuffer?: boolean;
+  useTerminalBuffer?: boolean;
+  useRenderProcess?: boolean;
   useRipgrep?: boolean;
   enableInteractiveShell?: boolean;
   shellBackgroundCompletionBehavior?: string;
@@ -866,6 +868,8 @@ export class Config implements McpContext, AgentLoopContext {
   private readonly skipNextSpeakerCheck: boolean;
   private readonly useBackgroundColor: boolean;
   private readonly useAlternateBuffer: boolean;
+  private readonly useTerminalBuffer: boolean;
+  private readonly useRenderProcess: boolean;
   private shellExecutionConfig: ShellExecutionConfig;
   private readonly extensionManagement: boolean = true;
   private readonly extensionRegistryURI: string | undefined;
@@ -1207,6 +1211,8 @@ export class Config implements McpContext, AgentLoopContext {
     this.useRipgrep = params.useRipgrep ?? true;
     this.useBackgroundColor = params.useBackgroundColor ?? true;
     this.useAlternateBuffer = params.useAlternateBuffer ?? false;
+    this.useTerminalBuffer = params.useTerminalBuffer ?? true;
+    this.useRenderProcess = params.useRenderProcess ?? true;
     this.enableInteractiveShell = params.enableInteractiveShell ?? false;
 
     const requestedBehavior = params.shellBackgroundCompletionBehavior;
@@ -3235,6 +3241,14 @@ export class Config implements McpContext, AgentLoopContext {
     return this.useAlternateBuffer;
   }
 
+  getUseTerminalBuffer(): boolean {
+    return this.useTerminalBuffer;
+  }
+
+  getUseRenderProcess(): boolean {
+    return this.useRenderProcess;
+  }
+
   getEnableInteractiveShell(): boolean {
     return this.enableInteractiveShell;
   }