Electron test: (regression) file in the file tree open with a single click

[jessfraz]

see the original issue here: https://github.com/KittyCAD/modeling-app/issues/2505

[Irev-Dev]

A failing test was written for this in e82b39d as this functionality is currently broken. (does not re-execute)

The test has the prefix test.fixme but it should only need minimal tweaking once the app has been fixed.