Windows: BeginChild(), Tables:fixed visibility of fully clipped child windows and tables to Test Engine.

imgui_tables.cpp

@@ -328,6 +328,7 @@ bool    ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
     if (use_child_window && IsClippedEx(outer_rect, 0) && !outer_window_is_measuring_size)
     {
         ItemSize(outer_rect);
+        ItemAdd(outer_rect, id);
         return false;
     }
 
@@ -1462,6 +1463,7 @@ void    ImGui::EndTable()
     // CursorPosPrevLine and CursorMaxPos manually. That should be a more general layout feature, see same problem e.g. #3414)
     if (inner_window != outer_window)
     {
+        inner_window->DC.NavLayersActiveMask |= 1 << ImGuiNavLayer_Main; // So empty table don't appear to navigate differently.
         EndChild();
     }
     else