[Bundle] inform that child windows are incompatible with imgui-node-editor

cf thedmd#242 (comment)

Author: pthom

imgui_canvas.cpp

@@ -32,6 +32,11 @@
 #     define ImDrawCallback_ImCanvas        (ImDrawCallback)(-2)
 # endif
 
+// [ADAPT_IMGUI_BUNDLE] inform that child windows are incompatible with imgui-node-editor (cf https://github.com/thedmd/imgui-node-editor/issues/242#issuecomment-2404714757)
+void Priv_ImGuiNodeEditor_EnterCanvas();
+void Priv_ImGuiNodeEditor_ExitCanvas();
+// [/ADAPT_IMGUI_BUNDLE]
+
 namespace ImCanvasDetails {
 
 DECLARE_HAS_MEMBER(HasFringeScale, _FringeScale);
@@ -199,6 +204,9 @@ bool ImGuiEx::Canvas::Begin(ImGuiID id, const ImVec2& size)
     }
     // [/ADAPT_IMGUI_BUNDLE]
 
+    // [ADAPT_IMGUI_BUNDLE] inform that child windows are incompatible with imgui-node-editor (cf https://github.com/thedmd/imgui-node-editor/issues/242#issuecomment-2404714757)
+    Priv_ImGuiNodeEditor_EnterCanvas();
+
     return true;
 }
 
@@ -242,6 +250,8 @@ void ImGuiEx::Canvas::End()
     }
     // [/ADAPT_IMGUI_BUNDLE]
 
+    // [ADAPT_IMGUI_BUNDLE] inform that child windows are incompatible with imgui-node-editor (cf https://github.com/thedmd/imgui-node-editor/issues/242#issuecomment-2404714757)
+    Priv_ImGuiNodeEditor_ExitCanvas();
 }
 
 void ImGuiEx::Canvas::SetView(const ImVec2& origin, float scale)