Enclosed a few more remaining sections in ifndef IMGUI_DISABLE_DEBUG_TOOLS for completeness.

imgui.cpp

@@ -4147,17 +4147,19 @@ bool ImGui::ItemHoverable(const ImRect& bb, ImGuiID id, ImGuiItemFlags item_flag
         return false;
     }
 
+#ifndef IMGUI_DISABLE_DEBUG_TOOLS
     if (id != 0)
     {
         // [DEBUG] Item Picker tool!
-        // We perform the check here because SetHoveredID() is not frequently called (1~ time a frame), making
-        // the cost of this tool near-zero. We can get slightly better call-stack and support picking non-hovered
-        // items if we performed the test in ItemAdd(), but that would incur a small runtime cost.
+        // We perform the check here because reaching is path is rare (1~ time a frame),
+        // making the cost of this tool near-zero! We could get better call-stack and support picking non-hovered
+        // items if we performed the test in ItemAdd(), but that would incur a bigger runtime cost.
         if (g.DebugItemPickerActive && g.HoveredIdPreviousFrame == id)
             GetForegroundDrawList()->AddRect(bb.Min, bb.Max, IM_COL32(255, 255, 0, 255));
         if (g.DebugItemPickerBreakId == id)
             IM_DEBUG_BREAK();
     }
+#endif
 
     if (g.NavDisableMouseHover)
         return false;
@@ -4792,6 +4794,7 @@ void ImGui::NewFrame()
     g.GroupStack.resize(0);
 
     // [DEBUG] Update debug features
+#ifndef IMGUI_DISABLE_DEBUG_TOOLS
     UpdateDebugToolItemPicker();
     UpdateDebugToolStackQueries();
     UpdateDebugToolFlashStyleColor();
@@ -4806,6 +4809,7 @@ void ImGui::NewFrame()
         g.DebugLogFlags &= ~g.DebugLogAutoDisableFlags;
         g.DebugLogAutoDisableFlags = ImGuiDebugLogFlags_None;
     }
+#endif
 
     // Create implicit/fallback window - which we will only render it if the user has added something to it.
     // We don't use "Debug" to avoid colliding with user trying to create a "Debug" window with custom flags.
@@ -4817,10 +4821,12 @@ void ImGui::NewFrame()
 
     // [DEBUG] When io.ConfigDebugBeginReturnValue is set, we make Begin()/BeginChild() return false at different level of the window-stack,
     // allowing to validate correct Begin/End behavior in user code.
+#ifndef IMGUI_DISABLE_DEBUG_TOOLS
     if (g.IO.ConfigDebugBeginReturnValueLoop)
         g.DebugBeginReturnValueCullDepth = (g.DebugBeginReturnValueCullDepth == -1) ? 0 : ((g.DebugBeginReturnValueCullDepth + ((g.FrameCount % 4) == 0 ? 1 : 0)) % 10);
     else
         g.DebugBeginReturnValueCullDepth = -1;
+#endif
 
     CallContextHooks(&g, ImGuiContextHookType_NewFramePost);
 }
@@ -7059,12 +7065,15 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
 
     // [DEBUG] io.ConfigDebugBeginReturnValue override return value to test Begin/End and BeginChild/EndChild behaviors.
     // (The implicit fallback window is NOT automatically ended allowing it to always be able to receive commands without crashing)
-    if (!window->IsFallbackWindow && ((g.IO.ConfigDebugBeginReturnValueOnce && window_just_created) || (g.IO.ConfigDebugBeginReturnValueLoop && g.DebugBeginReturnValueCullDepth == g.CurrentWindowStack.Size)))
+#ifndef IMGUI_DISABLE_DEBUG_TOOLS
+    if (!window->IsFallbackWindow)
+        if ((g.IO.ConfigDebugBeginReturnValueOnce && window_just_created) || (g.IO.ConfigDebugBeginReturnValueLoop && g.DebugBeginReturnValueCullDepth == g.CurrentWindowStack.Size))
         {
             if (window->AutoFitFramesX > 0) { window->AutoFitFramesX++; }
             if (window->AutoFitFramesY > 0) { window->AutoFitFramesY++; }
             return false;
         }
+#endif
 
     return !window->SkipItems;
 }
@@ -15561,9 +15570,6 @@ void ImGui::DebugLogV(const char*, va_list) {}
 void ImGui::ShowDebugLogWindow(bool*) {}
 void ImGui::ShowIDStackToolWindow(bool*) {}
 void ImGui::DebugHookIdInfo(ImGuiID, ImGuiDataType, const void*, const void*) {}
-void ImGui::UpdateDebugToolItemPicker() {}
-void ImGui::UpdateDebugToolStackQueries() {}
-void ImGui::UpdateDebugToolFlashStyleColor() {}
 
 #endif // #ifndef IMGUI_DISABLE_DEBUG_TOOLS