Misc: added assert to detect ~ImGuiContext() called without DestroyContext(). (#9051)

imgui.cpp

@@ -4277,6 +4277,11 @@ ImGuiContext::ImGuiContext(ImFontAtlas* shared_font_atlas)
     memset(TempKeychordName, 0, sizeof(TempKeychordName));
 }
 
+ImGuiContext::~ImGuiContext()
+{
+    IM_ASSERT(Initialized == false && "Forgot to call DestroyContext()?");
+}
+
 void ImGui::Initialize()
 {
     ImGuiContext& g = *GImGui;