Am I using NextColormapColor wrong?

[pozemka]

Hello! I've modified example Demo_CustomStyles to test NextColormapColor function:

void Demo_CustomStyles() {
    ImPlot::PushColormap(ImPlotColormap_Deep);
    // normally you wouldn't change the entire style each frame
    ImPlotStyle backup = ImPlot::GetStyle();
    MyImPlot::StyleSeaborn();
    if (ImPlot::BeginPlot("seaborn style")) {
        ImPlot::SetupAxes( "x-axis", "y-axis");
        ImPlot::SetupAxesLimits(-0.5f, 9.5f, 0, 10);
        unsigned int lin[10] = {8,8,9,7,8,8,8,9,7,8};
        unsigned int bar[10] = {1,2,5,3,4,1,2,5,3,4};
        unsigned int dot[10] = {7,6,6,7,8,5,6,5,8,7};
        ImPlot::PlotBars("Bars", bar, 10, 0.5f);
        ImPlot::PlotLine("Line", lin, 10);
        ImPlot::TagX(4, ImPlot::NextColormapColor()); // skip green
        ImPlot::PlotScatter("Scatter", dot, 10);
        ImPlot::EndPlot();
    }
    ImPlot::GetStyle() = backup;
    ImPlot::PopColormap();
}

I added TagX at position 4 and want it to have color assigned automatically (it should be green as it was skipped in the original example). But what I get is it changes color on every frame.

Have I misunderstood purpose of this function? And how should I get next avaliable color for Plot?

I know about GetColormapColor with indexed access but this would require some additional index keeping.