`coq-prog-name` disregarded and overwritten

[hendriktews]

Assume an environment that has coqtop with some version 8 and rocq with some version 9. After merging PR #841 PG will always run rocq, even if one configures coq-prog-name to "coqtop".

When coq-prog-name is configured to "coqtop", then after visiting the first .v file, coq-prog-name and proof-prog-name both still have the value "coqtop". However, when starting Coq/Rocq when the first line is asserted, both are overwritten to "rocq".

PG should support a feature, where the user can configure the Coq/Rocq binary via file or directory local variables.

Does anybody remember the reason why PG overwrites coq-prog-name?

[Matafou]

Hi. I don't know. Probably an oversight that happened when we decided that we should reconfigure Coq options (by reading the _CoqProject file) each time we start coq scripting. We could probably stop overwriting coq-prog-name.