bug#51362: python font-lock-mode in emacs 28 seems broken

[Jeff Spencer <jeffspencerd@gmail.com>]

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Also, the snapshot_spec when colored is `font-lock-function-name-face`, but
when not it has no face property.

On Sun, Oct 24, 2021 at 5:37 PM Jeff Spencer <jeffspencerd@gmail.com> wrote:

> Here is a somewhat minimal example. What is weird is it is inconsistent.
> If I save this as `test.py` and load it none of the `snapshot_spec` are
> colored, but they are just normal text. If on the line where snapshot_spec
> is defined I delete the tuple part of input_tuple it will be highlighted
> correctly and remains that way. Then if I go back up and I for example
> delete `| datetime` then it goes back to no color.
>
> ```
> from __future__ import annotations
>
> from datetime import datetime
>
> import pandas as pd
>
>
> def make_snapshot_temp(input_tuple: tuple, window: int, date: str |
> datetime) -> None:
>
>     snapshot_spec = pd.DataFrame(input_tuple, columns=["lead_id"])
>     snapshot_spec["snapshot_to_date"] = pd.to_datetime(date)
>
>     if window == 0:
>         snapshot_spec["snapshot_from_date"] = pd.to_datetime("2017-04-01")
>         snapshot_spec["snapshot_window"] = "all-time"
>
>     return snapshot_spec
> ```
>
> On Sun, Oct 24, 2021 at 7:45 AM Stefan Kangas <stefan@marxist.se> wrote:
>
>> Jeff Spencer <jeffspencerd@gmail.com> writes:
>>
>> > If you look at the link below it doesn't highlight the `post_split_...`
>> > variable but it does highlight the `df_train` variable below it
>> > correctly. The link shows my settings, but this happens when starting
>> > with emacs -Q as well. It seems the syntax highlighting got messed up
>> > with the addition of the f-strings code.
>>
>> Do you have an example file or snippet where font-lock fails?
>>
>

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