Actually this is the desired behavior, my idea was to be able to mark all the plants cared for that require care today, in addition to those that have not been cared for in the past. If for some reason you could not take care of a plant at a past time, these are not accumulated but kept in pending.

We cannot apply past care to a plant but we can do it as soon as possible, so I think the idea of taking care of all the plants is good that it also applies to the care that could not be taken care of and is applied at the moment of selecting the option.

I think we have the same idea, but I guess I didn't explain my point well enough. So I made a couple images and diagrams

The first image shows one of my plants. None of its task are due today:

The second image shows the same plant after I pressed "Care all" on the home screen. Note how all care tasks have been updated, although none of them were due today:

Looking at the code, I'd expect the logic in the careAllPlants Function to work similar to the following diagram. Also, I included a version of the current behaviour that would keep the current behaviour as well.

I see, now with the example I understand what you mean, thanks for detailing it.

The current implementation is not the right one because it also affects future care that should not be taken into account, so I think that this condition should be left as follows:

if (daysSinceLastCare != 0 && daysSinceLastCare >= c.cycles)

With this the expected behavior is achieved, the current plants will be taken care of and those that were not taken care of in the past, but future plants will not be touched.

What do you think?

This explains why I never saw some plants showing in the due today view. Apparently those were unexpectedly updated when using "Care All". I agree, plants not shown in due today or due in the past should not be updated when using the "care all" option, which should only update the plants shown in the today view / overdue view.

What you described in your last comment sounds like the expected behavior to me.