tone equalizer: graph and widget lose data when navigating history about darktable HOT 6 CLOSED

Confirmed (exact same version), although I initially thought I was not reproducing it because the graph widget was still displaying the selected adjustments. What disappears is the histogram in the background of the graph. You can also get it back by nudging the exposure/contrast compensation sliders or any point on the graph, just as you need to do when first activating it. So moving through the history clearly causes the module to lose its histogram information.

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@ralfbrown : May I assign this to you?

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It's a pixelpipe "thing". If you are doing as described you will have data from later modules still in cache so the tone equalizer is not processed and thus does not know it should update the internals.

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I can take a look, but probably not until early March. My guess is that this will require a mechanism for having modules reinitialize their internal data even when they are skipped due to their output being cached already.

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We have had such a problem for internal histograms too. Will have a look.

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Fixed in #16266

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