Resolving variables for tasks is not working anymore

[RomanNikitenko]

Bug Description:

I detected that resolving variables is not working at least for shell tasks.

Steps to Reproduce:

1. Add the following task to your tasks.json file

       {
            "type": "shell",
            "label": "TEST RESOLVING TASK",
            "command": "sleep 2 && echo the current file is ${file}"
        }

2. Open a file.
3. Run the task
4. See output for the task

You can try with other variables, like ${workspaceFolder}, for example

The expected behavior: the task's output should contain the path to the open file:

The actual behavior: there is an empty string instead of the path:

Additional Information

• Operating System: Fedora
• Theia Version: fd91f21

There is an error in the browser console:

[RomanNikitenko]

I tested for theia commit before these changes #9189 and resolving a variable for shell tasks works well for me.
So, it looks like the current issue is a regression after merging #9189.

[RomanNikitenko]

The issue was fixed by #9352
thanks @tsmaeder !