[search-in-workspace] Workspace search does not work in Electron with asar packaging

[Livven]

Description

Workspace search does not work in Electron with asar packaging enabled because rg cannot be spawned. The following message is shown when launching the Electron executable via a console:

process ERROR Error: spawn C:\path\to\application\resources\app.asar\node_modules\vscode-ripgrep\bin\rg.exe ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:232:19)
    at onErrorNT (internal/child_process.js:407:16)
    at process._tickCallback (internal/process/next_tick.js:63:19)

In the above path, app.asar should be replaced with app.asar.unpacked, as binaries cannot be in the asar file and have to be unpacked instead in order to be executable. However, the rg path (created here and used here) does not take this into account.

See also electron/electron#6262 for a general discussion about this issue.

Reproduction Steps

1. Enter anything in the workspace search box. No search results are shown.

OS and Theia version: Windows 10 1803, Theia 0.16.1.

Diagnostics: See above.

[Livven]

By the way I think a simple fix would be to unpack the full vscode-ripgrep folder, which should cause the correct path to be resolved. However that would require additional configuration from the user.

Considering that for example electron-builder can do smart detection of what needs to be unpacked it would be nicer if Theia would play along with that and handle this automatically as well.