diff --git a/3rdparty/ocornut-imgui/imgui.cpp b/3rdparty/ocornut-imgui/imgui.cpp
index a424ae6e8..e0092dece 100644
--- a/3rdparty/ocornut-imgui/imgui.cpp
+++ b/3rdparty/ocornut-imgui/imgui.cpp
@@ -131,11 +131,8 @@
             ImGui::NewFrame();
 
             // 3) most of your application code here
-            ImGui::Begin("My window");
-            ImGui::Text("Hello, world.");
-            ImGui::End();
-            MyGameUpdate(); // may use ImGui functions
-            MyGameRender(); // may use ImGui functions
+            MyGameUpdate(); // may use any ImGui functions, e.g. ImGui::Begin("My window"); ImGui::Text("Hello, world!"); ImGui::End();
+            MyGameRender(); // may use any ImGui functions
 
             // 4) render & swap video buffers
             ImGui::Render();
@@ -4106,7 +4103,7 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
         if (window->ScrollTarget.y < FLT_MAX)
         {
             float center_ratio = window->ScrollTargetCenterRatio.y;
-            window->Scroll.y = window->ScrollTarget.y - ((1.0f - center_ratio) * window->TitleBarHeight()) - (center_ratio * window->SizeFull.y);
+            window->Scroll.y = window->ScrollTarget.y - ((1.0f - center_ratio) * (window->TitleBarHeight() + window->MenuBarHeight())) - (center_ratio * window->SizeFull.y);
             window->ScrollTarget.y = FLT_MAX;
         }
         window->Scroll = ImMax(window->Scroll, ImVec2(0.0f, 0.0f));
@@ -5178,7 +5175,7 @@ void ImGui::SetScrollX(float scroll_x)
 void ImGui::SetScrollY(float scroll_y)
 {
     ImGuiWindow* window = GetCurrentWindow();
-    window->ScrollTarget.y = scroll_y + window->TitleBarHeight(); // title bar height canceled out when using ScrollTargetRelY
+    window->ScrollTarget.y = scroll_y + window->TitleBarHeight() + window->MenuBarHeight(); // title bar height canceled out when using ScrollTargetRelY
     window->ScrollTargetCenterRatio.y = 0.0f;
 }
 
@@ -9581,7 +9578,7 @@ static void SetClipboardTextFn_DefaultImpl(const char* text)
 #endif
 
 // Win32 API IME support (for Asian languages, etc.)
-#if defined(_WIN32) && !defined(IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCS)
+#if defined(_WIN32) && !defined(__GNUC__) && !defined(IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCS)
 
 #include <imm.h>
 #ifdef _MSC_VER
diff --git a/3rdparty/ocornut-imgui/imgui_draw.cpp b/3rdparty/ocornut-imgui/imgui_draw.cpp
index 20071ac6b..522edc527 100644
--- a/3rdparty/ocornut-imgui/imgui_draw.cpp
+++ b/3rdparty/ocornut-imgui/imgui_draw.cpp
@@ -18,9 +18,11 @@
 #include "imgui_internal.h"
 
 #include <stdio.h>      // vsnprintf, sscanf, printf
-#if !defined(alloca) && !defined(__FreeBSD__) && !defined(__DragonFly__)
+#if !defined(alloca)
 #ifdef _WIN32
 #include <malloc.h>     // alloca
+#elif (defined(__FreeBSD__) || defined(FreeBSD_kernel) || defined(__DragonFly__)) && !defined(__GLIBC__)
+#include <stdlib.h>     // alloca. FreeBSD uses stdlib.h unless GLIBC
 #else
 #include <alloca.h>     // alloca
 #endif