[BUG] Running a folder of tests doesn't always run all of that folder's tests

[dinofx]

Describe the bug
When launching all of the tests for a given folder, all of its tests should run.

To Reproduce
Steps to reproduce the behavior:

1. Filter the Tests view by the name of one test under some folder location
2. Click"Play" on the folder, attempting to run all tests in that folder

For example, the folder "sass" in the screenshot below was clicked:

Expected behavior
All tests in the clicked folder should run. It should launch with the testPathPattern set to the path that was run.

Instead, it behaves as if I multi-selected the filtered set of visible children and ran those (yes, I know multi-select isn't currently supported).