Unexpected lines highlighted in Rust after chain method removal

[petr-tik]

Thanks for reporting a bug! Please include all of the following:

(1) A description of the issue. A screenshot is often helpful too.

I renamed the variable and removed the last chained method call and I expected difft to only highlight that, instead all intermediate (unchanged) method calls in the chain are highlighted

(2) A copy of what you're diffing. If you're diffing files, include the before and after files.
See the screenshot above

If you're using difftastic with a VCS repository (e.g. git), include the URL and commit hash.

you should be able to repro here
https://github.com/LucioFranco/jj-spr/blob/93b0f224f477d01a753748e3390fa107917ef0f6/spr/src/github.rs#L354-L367

using difftastic with jj configured so
ui.diff-formatter = ["difft", "--color=always", "$left", "$right"]

(3) The version of difftastic you're using (see difft --version) and your operating system.

Difftastic 0.63.0

Toolchain: 1.83.0
System:    linux x86_64

[Wilfred]

Thanks for the report and the repro! Agreed that doesn't like like an optimal diff at all.

[petr-tik]

Minimised the diff further in this commit
LucioFranco/jj-spr@6726d84