@SamuMazzi Thanks for taking a swing at this. A couple things:

I think the following code in SetupAxis will only be called every frame if the user explicitly calls SetupAxis/SetupAxes in their plot code block. Since this is not required, this feature will not work in some scenarios (e.g. the Plot Shaded demo and others)

// cache previous range
axis.PreviousRange = ImPlotRange(axis.Range.Min, axis.Range.Max);

I think the solution here is to cache the previous range(s) in SetupFinish, just before UpdateInput. Lemme know what you think.

Second, I suggest we name this function something more descriptive and also consider if it should be callable per-axis, for instance:

bool IsAxisRangeChanging(ImAxis axis)