On 13/01/2020 12:28, Patrick Shanahan wrote:
* Jørn Villesen Christensen <darktable-...@mettle.dk> [01-13-20 05:14]:
Hi there,

I have been using Darktable 3.0 for a while – and thank you for your great
work. Darktable has some nice new features that I really enjoy.

However, there is one feature that I find a bit annoying, it has to do with
(implicit) discard of history.

Example:

1. I have a photo with say 20 edits in the history.
2. The last thing I have done was to play with a module, lets say Tone
    Curve, but decided against it. I therefore click on entry 19 in the
    history, and I get the photo before me playing around.
3. I leave the photo for a while and then come back to it. (Actually
    not necessary for anything else than demonstrating my poor memory :-D ).
4. When I come back to it, I decide to add a bit of noise filtering (a
    step I often add in the end because it is heavy on the processing).
    When I enable the de-noise filter, the whole image change lighting –
    and it takes me a second or two to realise that it is because the
    entry no. 20 (the reverted Tone curve edit) has not been discarded,
    but instead the history has been fast-forwarded and the de-noise has
    been added as entry 21.

In this scenario, I am used to edit no. 20 being discarded, and the de-noise
filter just applied on the image "as is".
*Unless* you "compress" the history stack, the focus location on the stack
is only pertinent if you make a new edit, then that "net edit" will
replace everything above your location on the stack.

Hm... now I cannot reproduce the thing either. It did happen to me a couple of times the last couple of days (and this morning) but it looks like I should have taken my time to make a "proof of concept" of it before mailing here.

Sorry for the noise and thank you for your replies. I will take up the issue again if I can nail it better.

~Jørn

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