Internals: PushItemFlag() flags are inherited by BeginChild().

CHANGELOG.txt

@@ -49,6 +49,7 @@ Other Changes:
  - BeginDragDropSource(): Offset tooltip position so it is off the mouse cursor, but also closer to it than regular tooltips, and not clamped by viewport. (#1739)
  - BeginCombo(), BeginMainMenuBar(), BeginChildFrame(): Temporary style modification are restored at the end of BeginXXX instead of EndXXX, to not affect tooltips and child windows.
  - Examples: GLFW: Made it possible to Shutdown/Init the backend again (by reseting the time storage properly). (#1827) [@ice1000]
+ - Internals: PushItemFlag() flags are inherited by BeginChild().
 
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imgui.cpp

@@ -6250,7 +6250,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         window->DC.ChildWindows.resize(0);
         window->DC.LayoutType = ImGuiLayoutType_Vertical;
         window->DC.ParentLayoutType = parent_window ? parent_window->DC.LayoutType : ImGuiLayoutType_Vertical;
-        window->DC.ItemFlags = ImGuiItemFlags_Default_;
+        window->DC.ItemFlags = parent_window ? parent_window->DC.ItemFlags : ImGuiItemFlags_Default_;
         window->DC.ItemWidth = window->ItemWidthDefault;
         window->DC.TextWrapPos = -1.0f; // disabled
         window->DC.ItemFlagsStack.resize(0);