Sliders broken for scientific notation + small values + logarithmic format

[chrismile]

Version/Branch of Dear ImGui:

Branch: master (at latest commit)

Back-ends:

any

Compiler, OS:

Ubuntu 22.04 + GCC

Full config/build information:

No response

Details:

When using ImGui::SliderScalar with a combination of scientific notation (e.g., "%.1e") plus ImGuiSliderFlags_Logarithmic plus small values, the dragging behavior is incorrect. It jumps between the values min, 1e+1 and max, which can be seen from the verifiable example.

This is probably highly related to #4341, but there the problem was simply described as losing "numbers from range (min, 10>". When the maximum is small, too, it seems like the problem is even greater, as not only a small amount of values is lost, but the slider will also assume values outside the min-max range.

I can also confirm, like #4341, that logarithmic_zero_epsilon is likely also the culprit here, too. It is set to 10, as ImParseFormatPrecision returns -1 for the scientific notation.

Screenshots/Video:

No response

Minimal, Complete and Verifiable Example code:

static float test_val = 1e-4f;
float test_lower = 1e-6f;
float test_higher = 1e-2f;
ImGui::SliderScalar("slider e", ImGuiDataType_Float, &test_val, &test_lower, &test_higher, "%e", ImGuiSliderFlags_Logarithmic);
ImGui::SliderScalar("slider .1e", ImGuiDataType_Float, &test_val, &test_lower, &test_higher, "%.1e", ImGuiSliderFlags_Logarithmic);