Add a button "Current Project" to Files in File System search

When you need to search in files within your project (sub)directories that are not added to the project files, you can alread use "Find in File System" with the engines "Internal" and "Git Grep".

However, the "Directory" is remembered from the last search, which may have been in a different project.

It would be nice, to have a button "Current Project" alongside the already existing "Browse" button. I also thought about variables, but I think a button makes more sense here.