Copy prompt parameters from custom workflows

[ronan36880]

This change makes it possible to also copy the parameters used in custom workflows. It works by going through all the metadata in the job and sets the matching widget's value.

This makes it so "Copy prompt" will now also work on custom workflows and automatically sets the values on the UI.

I had to implement a signal, but I'm unsure if it's the best approach to doing it, would love some feedback on this if possible.

[Acly]

It might be simpler, can you try:

# custom_workflow.py
class CustomWorkspace:
    def try_set_params(params: dict):
        self.params = _coerce(params, self.metadata)

# ui/generation.py in _copy_prompt
self._model.custom.try_set_params(job.params.metadata)

Should not require the signal, or any changes in the custom param UI part. And it will also take care of cases like having a different workflow which uses a param with the same name, but it has a different type (eg. string instead of number).

Edit: you might want a slightly different version of _coerce which uses the previous value if the job params don't have a match, rather than the default.

[ronan36880]

I tried going with that approach, I still had to emit the graph_changed signal for the UI widgets to update. Should the extra coerce logic be in a separate method like it is right now, or should they both be merged into one somehow?

[Acly]

Should the extra coerce logic be in a separate method like it is right now, or should they both be merged into one somehow?

Isn't coerce the same as coerce_with_fallback and passing a empty dict {} as fallback?

[ronan36880]

Should the extra coerce logic be in a separate method like it is right now, or should they both be merged into one somehow?

Isn't coerce the same as coerce_with_fallback and passing a empty dict {} as fallback?

Great catch! I went ahead and made the original _coerce call _coerce_with_fallback with an empty dict.

[Acly]

Merged, thanks for the PR!