Remove duplicate results when activating multiple `ImageViewer` modules

[berceanu]

Feature description

ImageViewer(name="One plot", img_globs=["my_amazing_plot.png"]),
ImageViewer(name="All Plots"),

It would be nice if "my_amazing_plot.png" would not appear twice on the dashboard page.

Proposed solution

Perhaps one one module is activated, it could check the output from the other modules and eliminate the duplicates?

[bdice]

Hmm. I see your point, but I think I would advocate for users to set specific globs for each ImageViewer module, or only use one with the default setting (all jpg/png/... files). Communicating between modules/cards would require a fair bit of effort and the benefit seems small. Can you help explain why you chose your approach over one of those alternatives?

[berceanu]

I often have many .pngs as output from postprocessing (>10 / job) and showing them all by default would result in a lot of clutter. So I select a few (2-3) as separate ImageViewer modules and add a general ImageViewer for the rest. Except it's not really the rest, it's the duplicates plus the rest :)

However this is not a big issue, I can definately work around it if the implementation is costly.

[bdice]

Another alternative would be to change the behavior of img_globs to allow a callable. The callable would act on filenames in the job directory as a filter (True means show, False means hide). This would make it easier to construct a custom set of images that excludes previously shown images.

[berceanu]

Yes, sounds easier than setting up inter-module communication.