Demo: Fixed "Log" demo not initializing properly, leading to the first line not showing before a Clear. (#2318) [@bluescan]

docs/CHANGELOG.txt

@@ -44,6 +44,7 @@ Other Changes:
 - ImFontAtlas: Added 0x2000-0x206F general punctuation range to default ChineseFull/ChineseSimplifiedCommon ranges. (#2093)
 - ImFontAtlas: FreeType: Added support for imgui allocators + custom FreeType only SetAllocatorFunctions. (#2285) [@Vuhdo]
 - ImFontAtlas: FreeType: Fixed using imgui_freetype.cpp in unity builds. (#2302)
+- Demo: Fixed "Log" demo not initializing properly, leading to the first line not showing before a Clear. (#2318) [@bluescan]
 - Examples: Win32: Using GetForegroundWindow()+IsChild() instead of GetActiveWindow() to be compatible with windows created
   in a different thread or parent. (#1951, #2087, #2156, #2232) [many people]
 - Examples: Win32: Added support for XInput games (if ImGuiConfigFlags_NavEnableGamepad is enabled).

imgui_demo.cpp

@@ -3397,6 +3397,12 @@ struct ExampleAppLog
     ImVector<int>       LineOffsets;        // Index to lines offset. We maintain this with AddLog() calls, allowing us to have a random access on lines
     bool                ScrollToBottom;
 
+    ExampleAppLog()
+    {
+        ScrollToBottom = false;
+        Clear();
+    }
+
     void    Clear()
     {
         Buf.clear();