keyboard Tab is error

previous After I press tab, I search ruby doc, if I only need search ruby doc, I can press tab, then I can search ruby singlely,
but now, if I press tab, will not

No file, test, or entry point is named. Reproduce the Tab behavior described while searching Ruby documentation, then trace the keyboard and search handling from the relevant entry point. Done means Tab again permits searching Ruby alone as described, with coverage for the corrected behavior.

Written by the indexing model from the issue text.