Warning fixes.

diff --git a/imgui.cpp b/imgui.cpp
index 8972baa..20ccc02 100644
--- a/imgui.cpp
+++ b/imgui.cpp

@@ -7224,7 +7224,7 @@
             if (bg_col & IM_COL32_A_MASK)
             {
                 ImRect bg_rect(window->Pos + ImVec2(0, window->TitleBarHeight), window->Pos + window->Size);
-                ImDrawFlags bg_rounding_flags = (flags & ImGuiWindowFlags_NoTitleBar) ? 0 : ImDrawFlags_RoundCornersBottom;
+                ImDrawFlags bg_rounding_flags = (flags & ImGuiWindowFlags_NoTitleBar) ? ImDrawFlags_RoundCornersAll : ImDrawFlags_RoundCornersBottom;
                 ImDrawList* bg_draw_list = window->DrawList;
                 bg_draw_list->AddRectFilled(bg_rect.Min, bg_rect.Max, bg_col, window_rounding, bg_rounding_flags);
             }

diff --git a/imgui.h b/imgui.h
index c91a13b..376a008 100644
--- a/imgui.h
+++ b/imgui.h

@@ -3256,7 +3256,7 @@
     ImDrawFlags_RoundCornersAll             = ImDrawFlags_RoundCornersTopLeft | ImDrawFlags_RoundCornersTopRight | ImDrawFlags_RoundCornersBottomLeft | ImDrawFlags_RoundCornersBottomRight,
     ImDrawFlags_RoundCornersDefault_        = ImDrawFlags_RoundCornersAll, // Default to ALL corners if none of the _RoundCornersXX flags are specified.
     ImDrawFlags_RoundCornersMask_           = ImDrawFlags_RoundCornersAll | ImDrawFlags_RoundCornersNone,
-    ImDrawFlags_InvalidMask_                = 0x8000000F,
+    ImDrawFlags_InvalidMask_                = (ImDrawFlags)0x8000000F,
 };
 
 // Flags for ImDrawList instance. Those are set automatically by ImGui:: functions from ImGuiIO settings, and generally not manipulated directly.