Problem when adding workflow_dispatch

I'd like this action to scan for more than just the last commit, so I forked it to scan all code (not commits). After adding a new action, I wanted to create a selection for users to select via input:
'last_commit' - Scan the last commit
'whole_repo' - Scan the entire repository

When I use workflow_dispatch with this selection, the main action scans all commits, so previous leaks are detected and the action fails every time.

Is this the expected behavior of this action?
Is it possible to configure this action to scan code, not commits?

Start with the workflow_dispatch input selection and the main action entry point, reproducing the last_commit and whole_repo cases described in the issue. Determine whether the action scans commits or repository contents for each selection; done means the intended scope is established and the behavior is either corrected or clearly documented.

Written by the indexing model from the issue text.