tests: demonstrate error when narrowing with `rootfilesin:` pattern This demonstrates a bug introduced in 17a822d7943e.

matchers: use correct method for finding index in vector The path matcher has an optimization for when all paths are `rootfilesin:`. This optimization exists in both Python and Rust. However, the Rust implementation currently has a bug that makes it fail in most cases. The bug is that it `rfind()` where it was clearly intended to use `rposition()`. This patch fixes that and adds a test.

dirstate: make the `transaction` argument of `setbranch` mandatory This is deprecated since 6.4. We should drop it now.

rust-clippy: apply some more trivial fixes All of these were hinted at by clippy and make the code simpler.

rust-clippy: simplify `match` to `if let` This was hinted at by clippy, and makes it more obvious that nothing is happening in the `None` case.

censor: accept multiple revision in a single call This is useful when dealing with corruption, as all the corrupted revision can be dealt with in one go.

censor: be more verbose about the other steps too If we informs the user about head checking, we should tell him when the other operation happens too. Otherwise the user can imagine to still be in the head checking part.

censor: add a command flag to skip the head checks In some case we spend hours of time checking the heads to censors a simple file is not a good behavior. Especially when censors is used to removed corrupted content.

censor: inform the user that we are spending time checking heads The time this can consume can be a surprise to the user, lets be explicit about it.

censor: mention that we check the heads in the help And add a message to will explain the possibly long time spent doing this.