I’ve just posted a feature request on redmine, and wonder if anyone else is interested in such a feature, and would like to collaborate in implementing it?
2.6 brought about a magnificent improvement in collection filtering ability.
I would think that an incremental enhancement to this filtering would be to select for darkroom module used. At the moment the only possibility is to either use the history filter, or, equivalently, use the tag filter for darktable|altered. When I have many (> 20) images of a subject, I would be glad to be able to filter by an arbitrarily chosen darkroom module in the history. For example, all images I have applied crop/rotate to, or tone mapping to, or that I have denoised.
I’m prepared to put some work into this, but I’d need some hand-holding: my coding in C goes back to my first university days: 1988-1991. I can pull the entire source repository, but I don’t know where to start with locating the collect images filtering code, or how to extract the database information for history for each image in the currnt selection.