[MDL-61118] Uploaded TGZ file using filepicker displays "Unzip" option, but is unable to unzip - Moodle Tracker

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Affected Branches:
MOODLE_33_STABLE, MOODLE_34_STABLE
Pull from Repository:
git://github.com/mihailges/moodle.git
Pull Master Branch:
MDL-61118-master-1
Pull Master Diff URL:
https://github.com/mihailges/moodle/compare/6735197cc2...MDL-61118-master-1
Testing Instructions:
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Create a course.

Add Folder resource to the course.

In "Adding a new Folder":

Upload a .tgz file using the filepicker.

Click on the uploaded .tgz file in the select files area. Modal should pop-up.

make sure the "Unzip" button is displayed in the modal.

Press on the "Unzip" button.

make sure the content from the .tgz file has been successfully unzipped and displayed in the files area.

Repeat steps 1, 2, 3 by uploading other archived files (ex. .7z, .gz, etc.).

make sure each time the content from the archived files has been successfully unzipped and displayed in the files area.**
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Create a course. Add Folder resource to the course. In "Adding a new Folder": Upload a .tgz file using the filepicker. Click on the uploaded .tgz file in the select files area. Modal should pop-up. make sure the "Unzip" button is displayed in the modal. Press on the "Unzip" button. make sure the content from the .tgz file has been successfully unzipped and displayed in the files area. Repeat steps 1, 2, 3 by uploading other archived files (ex. .7z, .gz, etc.). make sure each time the content from the archived files has been successfully unzipped and displayed in the files area. **

This bug was discovered in testing ~~MDL-43827~~.

Steps to replicate:

Create a course.
Add Folder resource to the course.
In "Adding a new Folder":
1. Upload a TGZ file using the filepicker
2. Select the uploaded TGZ file using the keyboard (navigate by pressing "Tab", press "Enter" to open / mouse click on file).
3. Navigate through the pop-up using the keyboard and attempt to unzip the file using keyboard (press "Enter" on "Unzip" / mouse click on "Unzip").

Expected behaviour:

If TGZ files are supported for unzipping, the TGZ file should unzip.
- Or
If TGZ files are not supported for unzipping, the "Unzip" button in the pop-up should not be displayed.

Current behaviour:

The Unzip button closes the popup and any files listed in the Files area is cleared.
No unzipping functionality is performed on the TGZ file.

Component watchers:: David Woloszyn, Huong Nguyen, Jake Dallimore, Meirza, Michael Hawkins, Raquel Ortega, Safat Shahin, Stevani Andolo