SliderFloat: Fixed grab size and steps with %g format. (#642, #1301)

imgui.cpp

@@ -8689,6 +8689,8 @@ int ImGui::ParseFormatPrecision(const char* fmt, int default_precision)
 static float GetMinimumStepAtDecimalPrecision(int decimal_precision)
 {
     static const float min_steps[10] = { 1.0f, 0.1f, 0.01f, 0.001f, 0.0001f, 0.00001f, 0.000001f, 0.0000001f, 0.00000001f, 0.000000001f };
+    if (decimal_precision < 0)
+        return FLT_MIN;
     return (decimal_precision >= 0 && decimal_precision < 10) ? min_steps[decimal_precision] : powf(10.0f, (float)-decimal_precision);
 }
 
@@ -8737,7 +8739,7 @@ bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v
 
     const bool is_non_linear = (power < 1.0f-0.00001f) || (power > 1.0f+0.00001f);
     const bool is_horizontal = (flags & ImGuiSliderFlags_Vertical) == 0;
-    const bool is_decimal = ParseFormatPrecision(format, 3) > 0;
+    const bool is_decimal = ParseFormatPrecision(format, 3) != 0;
 
     const float grab_padding = 2.0f;
     const float slider_sz = is_horizontal ? (frame_bb.GetWidth() - grab_padding * 2.0f) : (frame_bb.GetHeight() - grab_padding * 2.0f);