Separate qgis_process params with -- (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#39349
Author: @m-kuhn
QGIS version: 3.16

Separate qgis_process params with --

PR Description:

Description

Collision free parameters for qgis_process by separating executable args and algorithm args with --

qgis_process run algname --distanceUnits=meters -- PARAM1=23 PARAM2=/path/to/file distanceUnits=someOtherParam

Still supports the legacy version using --PARAM=VALUE syntax

@nyalldawson looking for your feedback before finetuning

Commits tagged with [need-docs] or [FEATURE]

[m-kuhn]

@nyalldawson could you send me to where the docs need updating?

[DelazJ]

@m-kuhn If you mean "in the user manual", there's no mention of the qgis_process feature, yet.
If you feel like doing it, maybe add something under (or after?) the Processing frameworks chapter? I must admit that I don't know the full scope of this tool so feel free to disagree.
Another place I can think of, is https://docs.qgis.org/testing/en/docs/user_manual/introduction/qgis_configuration.html#running-qgis-with-advanced-settings but not sure how deep we can go there (nor the information we want to provide on this tool).