Support incremental update experiment flag. (#12926)

packages/cli/src/config/settingsSchema.ts

@@ -502,6 +502,16 @@ const SETTINGS_SCHEMA = {
           'Use an alternate screen buffer for the UI, preserving shell history.',
         showInDialog: true,
       },
+      incrementalRendering: {
+        type: 'boolean',
+        label: 'Incremental Rendering',
+        category: 'UI',
+        requiresRestart: true,
+        default: true,
+        description:
+          'Enable incremental rendering for the UI. This option will reduce flickering but may cause rendering artifacts. Only supported when useAlternateBuffer is enabled.',
+        showInDialog: true,
+      },
       customWittyPhrases: {
         type: 'array',
         label: 'Custom Witty Phrases',