"find box" of the help pages viewer does not work

Describe the bug

The "find box" of the help pages viewer does not work.

To Reproduce

1. Open a help page, e.g. ?table
2. Press CTRL + F to open the "find box"
3. Type a word that exists on the page, e.g. table
4. Occurences of the word are not highlighted and nothing happens when pressing the arrow buttons

Can you fix this issue by yourself? (We appreciate the help)

No

Expected behavior

Occurences of the word should be highlighted

Screenshots

Environment (please complete the following information):

• OS: Windows
• VSCode Version: VSCodium 1.106.37943
• R Version: 4.4.0
• vscode-R version: 2.8.6

從說明頁面檢視器開始，開啟尋找框並搜尋 table，以重現 ?table 的問題。追蹤檢視器對尋找框的處理；當相符的出現位置被醒目標示，且箭頭按鈕可以在它們之間導覽時，就完成了。