Drags, Sliders: fixed an overflow using ImGuiSliderFlags_Logarithmic with S32/S64 types. (#9526, #3361, #1823, #1316, #642)

docs/CHANGELOG.txt

@@ -52,6 +52,9 @@ Breaking Changes:
 
 Other Changes:
 
+- Drags, Sliders:
+  - Fixed an overflow using `ImGuiSliderFlags_Logarithmic` with S32/S64 types which
+    leads to clamped interactions. (#9526, #3361, #1823, #1316, #642) [@lailoken]
 - Fonts:
   - Reworked `AddFontDefault()` to use `io.DisplayFrameBufferScale` as part of the heuristic
     to select `AddFontDefaultVector()` by default, effectively using ProggyForever instead of

imgui_widgets.cpp

@@ -3006,7 +3006,7 @@ float ImGui::ScaleRatioFromValueT(ImGuiDataType data_type, TYPE v, TYPE v_min, T
             result = 0.0f; // Workaround for values that are in-range but below our fudge
         else if (v_clamped >= v_max_fudged)
             result = 1.0f; // Workaround for values that are in-range but above our fudge
-        else if ((v_min * v_max) < 0.0f) // Range crosses zero, so split into two portions
+        else if (((FLOATTYPE)v_min * (FLOATTYPE)v_max) < 0.0f) // Range crosses zero, so split into two portions
         {
             float zero_point_center = (-(float)v_min) / ((float)v_max - (float)v_min); // The zero point in parametric space.  There's an argument we should take the logarithmic nature into account when calculating this, but for now this should do (and the most common case of a symmetrical range works fine)
             float zero_point_snap_L = zero_point_center - zero_deadzone_halfsize;
@@ -3060,7 +3060,7 @@ TYPE ImGui::ScaleValueFromRatioT(ImGuiDataType data_type, float t, TYPE v_min, T
 
         float t_with_flip = flipped ? (1.0f - t) : t; // t, but flipped if necessary to account for us flipping the range
 
-        if ((v_min * v_max) < 0.0f) // Range crosses zero, so we have to do this in two parts
+        if (((FLOATTYPE)v_min * (FLOATTYPE)v_max) < 0.0f) // Range crosses zero, so we have to do this in two parts
         {
             float zero_point_center = (-(float)ImMin(v_min, v_max)) / ImAbs((float)v_max - (float)v_min); // The zero point in parametric space
             float zero_point_snap_L = zero_point_center - zero_deadzone_halfsize;