Allow ripgrep to search files in hidden folders

[ishche]

Problem Description

vscode.workspace.findFiles ignores hidden folders.

How to test

1. create .test/file.js file in the workspace.
2. Call vscode.workspace.findFiles("**/*.js")

Old behavior:
search result empty

Now:
.test/file.js in result of search

OS and Theia version:
MacOs Theia from master.

Diagnostics:
Arguments for search in theia:

theia/packages/file-search/src/node/file-search-service-impl.ts

Line 144 in 93ffbab

const args = ['--files', '--case-sensitive'];

But vscode has --hidden: https://github.com/microsoft/vscode/blob/955ff025c39bcc919e7b828bc14239215f6b20ad/src/vs/workbench/services/search/node/ripgrepFileSearch.ts#L33

Review checklist

• as an author, I have thoroughly tested my changes and carefully followed the review guidelines

[vince-fugnitto]

@ishche can you please squash your commits?
Do you have a sample vscode extension which calls the vscode.workspace.findFiles command so that reviewers can easily test your changes without the need to each create their own plugin?

[thegecko]

Would this return results in the .git folder if the workspace is under source control?

[akosyakov]

Would this return results in the .git folder if the workspace is under source control?

I think it would include .git always, at least if it is not excluded by workspace search preferences.

Actually we exclude them always already:

theia/packages/file-search/src/browser/quick-file-open.ts

Line 200 in 1ca3ec3

excludePatterns: ['*.git*']

so it should not change

[akosyakov]

let's try it, .git seems to be always excluded from UI search, not sure how it is important for vscode api

[ishche]

@ishche can you please squash your commits?
Do you have a sample vscode extension which calls the vscode.workspace.findFiles command so that reviewers can easily test your changes without the need to each create their own plugin?

I've created a simple extension to test this PR. (also available in vscode marketplace)

To test it there, call Example: Find Files command. It will show a list of found files.