Fixed Y scroll aiming when Horizontal Scrollbar is enabled (#665). Tweak log demo.

imgui.cpp

@@ -4200,7 +4200,7 @@ 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() + window->MenuBarHeight())) - (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->ScrollbarSizes.y));
             window->ScrollTarget.y = FLT_MAX;
         }
         window->Scroll = ImMax(window->Scroll, ImVec2(0.0f, 0.0f));

imgui_demo.cpp

@@ -2464,10 +2464,10 @@ static void ShowExampleAppLog(bool* p_open)
 {
     static ExampleAppLog log;
 
-    // Demo fill
+    // Demo: add random items (unless Ctrl is held)
     static float last_time = -1.0f;
     float time = ImGui::GetTime();
-    if (time - last_time >= 0.3f)
+    if (time - last_time >= 0.20f && !ImGui::GetIO().KeyCtrl)
     {
         const char* random_words[] = { "system", "info", "warning", "error", "fatal", "notice", "log" };
         log.AddLog("[%s] Hello, time is %.1f, rand() %d\n", random_words[rand() % IM_ARRAYSIZE(random_words)], time, (int)rand());