Fix for correctness and allow non-auto resized modals to have window minimum size applied - hopefully no-side effects (#249)

imgui.cpp

@@ -3734,7 +3734,7 @@ bool ImGui::Begin(const char* name, bool* p_opened, const ImVec2& size_on_first_
         }
 
         // Minimum window size
-        if (!(flags & (ImGuiWindowFlags_ChildWindow | ImGuiWindowFlags_Popup | ImGuiWindowFlags_ChildMenu | ImGuiWindowFlags_Tooltip)))
+        if (!(flags & (ImGuiWindowFlags_ChildWindow | ImGuiWindowFlags_AlwaysAutoResize)))
         {
             window->SizeFull = ImMax(window->SizeFull, style.WindowMinSize);
             if (!window->Collapsed)