Sliders: Fixed using ImGuiSliderFlags_ClampOnInput with reverse sliders. (#3432, #3449)

docs/CHANGELOG.txt

@@ -51,6 +51,8 @@ Other Changes:
 - InputText: Fixed callback's helper DeleteChars() function when cursor is inside the deleted block. (#3454).
 - DragFloat, DragScalar: Fixed ImGuiSliderFlags_ClampOnInput not being honored in the special case
   where v_min == v_max. (#3361)
+- SliderInt, SliderScalar: Fixed reaching of maximum value with inverted integer min/max ranges, both
+  with signed and unsigned types. Added reverse Sliders to Demo. (#3432, #3449) [@rokups]
 - BeginMenuBar: Fixed minor bug where CursorPosMax gets pushed to CursorPos prior to calling BeginMenuBar(),
   so e.g. calling the function at the end of a window would often add +ItemSpacing.y to scrolling range.
 - TreeNode, CollapsingHeader: Made clicking on arrow toggle toggle the open state on the Mouse Down event

imgui_widgets.cpp

@@ -3191,7 +3191,11 @@ bool ImGui::TempInputScalar(const ImRect& bb, ImGuiID id, const char* label, ImG
         // Apply new value (or operations) then clamp
         DataTypeApplyOpFromText(data_buf, g.InputTextState.InitialTextA.Data, data_type, p_data, NULL);
         if (p_clamp_min || p_clamp_max)
+        {
+            if (DataTypeCompare(data_type, p_clamp_min, p_clamp_max) > 0)
+                ImSwap(p_clamp_min, p_clamp_max);
             DataTypeClamp(data_type, p_data, p_clamp_min, p_clamp_max);
+        }
 
         // Only mark as edited if new value is different
         value_changed = memcmp(&data_backup, p_data, data_type_size) != 0;