Clipper: Added IncludeIndex() helper to include a single item. (#6424, …

…#3841)

docs/CHANGELOG.txt

@@ -55,6 +55,7 @@ Other changes:
   setting large values. (#6749)
 - InputFloat, SliderFloat, DragFloat: always turn both '.' and ',' into the current decimal
   point character when using Decimal/Scientific character filter. (#6719, #2278) [@adamsepp]
+- Clipper: Added IncludeByIndex() helper to include a single item. (#6424, #3841)
 - ImDrawData: Fixed an issue where TotalVtxCount/TotalIdxCount does not match the sum
   of individual ImDrawList's buffer sizes when a dimming/modal background is rendered. (#6716)
 - ImDrawList: Fixed OOB access in _CalcCircleAutoSegmentCount when passing excessively

imgui.h

@@ -2405,8 +2405,9 @@ struct ImGuiListClipper
     IMGUI_API void  End();             // Automatically called on the last call of Step() that returns false.
     IMGUI_API bool  Step();            // Call until it returns false. The DisplayStart/DisplayEnd fields will be set and you can process/draw those items.
 
-    // Call IncludeRangeByIndices() *BEFORE* first call to Step() if you need a range of items to not be clipped, regardless of their visibility.
+    // Call IncludeByIndex() or IncludeRangeByIndices() *BEFORE* first call to Step() if you need a range of items to not be clipped, regardless of their visibility.
     // (Due to alignment / padding of certain items it is possible that an extra item may be included on either end of the display range).
+    inline void     IncludeByIndex(int item_index) { IncludeRangeByIndices(item_index, item_index + 1); }
     IMGUI_API void  IncludeRangeByIndices(int item_begin, int item_end); // item_end is exclusive e.g. use (42, 42+1) to make item 42 never clipped.
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS