Selectable() render into AutoFitPadding but do not extend it, fixing small visual gap

Followup 2e26196aba /  #1

imgui.cpp

@@ -6768,8 +6768,9 @@ bool ImGui::Selectable(const char* label, bool selected, const ImVec2& size_arg)
     
     const float w = ImMax(label_size.x, window->Pos.x + ImGui::GetContentRegionMax().x - style.AutoFitPadding.x - window->DC.CursorPos.x);
     const ImVec2 size(size_arg.x != 0.0f ? size_arg.x : w, size_arg.y != 0.0f ? size_arg.y : label_size.y);
-    const ImRect bb(window->DC.CursorPos, window->DC.CursorPos + size);
+    ImRect bb(window->DC.CursorPos, window->DC.CursorPos + size);
     ItemSize(bb);
+    bb.Max.x += style.AutoFitPadding.x;
 
     // Selectables are meant to be tightly packed together. So for both rendering and collision we extend to compensate for spacing.
     ImRect bb_with_spacing = bb;