Windows: tidying up skipitems logic at end of Begin(), normally shoul…

…d be no meaningful side-effect.

imgui.cpp

@@ -6915,18 +6915,15 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
     // Update visibility
     if (first_begin_of_the_frame)
     {
-        if (flags & ImGuiWindowFlags_ChildWindow)
+        if ((flags & ImGuiWindowFlags_ChildWindow) && !(flags & ImGuiWindowFlags_ChildMenu))
         {
             // Child window can be out of sight and have "negative" clip windows.
             // Mark them as collapsed so commands are skipped earlier (we can't manually collapse them because they have no title bar).
             IM_ASSERT((flags & ImGuiWindowFlags_NoTitleBar) != 0);
-            if (!(flags & ImGuiWindowFlags_AlwaysAutoResize) && window->AutoFitFramesX <= 0 && window->AutoFitFramesY <= 0) // FIXME: Doesn't make sense for ChildWindow??
-            {
-                const bool nav_request = (flags & ImGuiWindowFlags_NavFlattened) && (g.NavAnyRequest && g.NavWindow && g.NavWindow->RootWindowForNav == window->RootWindowForNav);
-                if (!g.LogEnabled && !nav_request)
-                    if (window->OuterRectClipped.Min.x >= window->OuterRectClipped.Max.x || window->OuterRectClipped.Min.y >= window->OuterRectClipped.Max.y)
-                        window->HiddenFramesCanSkipItems = 1;
-            }
+            const bool nav_request = (flags & ImGuiWindowFlags_NavFlattened) && (g.NavAnyRequest && g.NavWindow && g.NavWindow->RootWindowForNav == window->RootWindowForNav);
+            if (!g.LogEnabled && !nav_request)
+                if (window->OuterRectClipped.Min.x >= window->OuterRectClipped.Max.x || window->OuterRectClipped.Min.y >= window->OuterRectClipped.Max.y)
+                    window->HiddenFramesCanSkipItems = 1;
 
             // Hide along with parent or if parent is collapsed
             if (parent_window && (parent_window->Collapsed || parent_window->HiddenFramesCanSkipItems > 0))