Searchable file editor and preview

[yumiao5279]

It would be great to optimize the current built-in file tree and text editor。Currently, when searching for code snippets, it is still inconvenient to jump to other IDEs for operation. My suggestion is:

1. Search for strings in the file tree, double-click the file to directly jump to the corresponding location
2. Search for a certain content in the file tree. After double clicking the file, the file editor and browser that opens can support searching