Revert thinking code changes

Author: jahooma

cli/src/utils/block-operations.ts

@@ -12,17 +12,6 @@ import type {
   TextContentBlock,
 } from '../types/chat'
 
-const SHORT_THINKING_LINE_THRESHOLD = 5
-const SHORT_THINKING_CHAR_LIMIT = 500
-
-/**
- * Returns true if the thinking content is short enough to stay uncollapsed.
- */
-export const isShortThinkingContent = (content: string): boolean => {
-  const trimmed = content.trim()
-  return trimmed.split('\n').length <= SHORT_THINKING_LINE_THRESHOLD && trimmed.length <= SHORT_THINKING_CHAR_LIMIT
-}
-
 let thinkingIdCounter = 0
 const generateThinkingId = (): string => {
   thinkingIdCounter++
@@ -245,12 +234,10 @@ const appendTextWithThinkParsingToBlocks = (
       const thinkingOpen =
         !hasMoreSegments && !textToParse.includes(THINK_CLOSE_TAG)
 
-      const closedContent = currentLastBlock.content + firstSegment.content
       nextBlocks[nextBlocks.length - 1] = {
         ...currentLastBlock,
-        content: closedContent,
+        content: currentLastBlock.content + firstSegment.content,
         thinkingOpen,
-        ...(!thinkingOpen && isShortThinkingContent(closedContent) && { isCollapsed: false }),
       }
     }
     segmentStartIdx = 1
@@ -262,7 +249,6 @@ const appendTextWithThinkParsingToBlocks = (
       nextBlocks[nextBlocks.length - 1] = {
         ...currentLastBlock,
         thinkingOpen: false,
-        ...(isShortThinkingContent(currentLastBlock.content) && { isCollapsed: false }),
       }
     }
   }
@@ -399,7 +385,6 @@ export const closeNativeReasoningBlock = (
   nextBlocks[lastReasoningIndex] = {
     ...reasoningBlock,
     thinkingOpen: false,
-    ...(isShortThinkingContent(reasoningBlock.content) && { isCollapsed: false }),
   }
   return nextBlocks
 }

cli/src/utils/message-block-helpers.ts

@@ -1,6 +1,5 @@
 import { isEqual } from 'lodash'
 
-import { isShortThinkingContent } from './block-operations'
 import { formatToolOutput } from './codebuff-client'
 import { shouldCollapseByDefault, shouldCollapseForParent } from './constants'