Move demo in the Polygon_repair directory

GraphicsView/demo/Polygon_repair/Boolean_2.cpp

@@ -176,9 +176,7 @@ MainWindow::processInput(CGAL::Object o)
     }
   }
   if((! mpwhA.is_empty()) && (! mpwhB.is_empty())){
-    Boolean boolean;
-    boolean.insert(mpwhA, mpwhB);
-    mpwhC = boolean([](bool a, bool b){ return a && b;});
+    mpwhC = CGAL::Polygon_repair::join(mpwhA, mpwhB);
   }
   Q_EMIT( changed());
 }

GraphicsView/demo/Polygon_repair/CMakeLists.txt

@@ -0,0 +1,35 @@
+# Created by the script cgal_create_cmake_script
+# This is the CMake script for compiling a CGAL application.
+
+cmake_minimum_required(VERSION 3.12...3.29)
+project(Triangulation_2_Demo)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_INCLUDE_CURRENT_DIR TRUE)
+
+find_package(CGAL REQUIRED OPTIONAL_COMPONENTS Qt6)
+find_package(Qt6 QUIET COMPONENTS Widgets)
+
+if(NOT CGAL_Qt6_FOUND OR NOT Qt6_FOUND)
+  message("NOTICE: This demo requires CGAL and Qt6, and will not be compiled.")
+  return()
+endif()
+
+add_definitions(-DQT_NO_KEYWORDS)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+
+
+qt_add_executable(
+  Boolean_2 Boolean_2.cpp
+  Boolean_2.ui Boolean_2.qrc)
+target_link_libraries(Boolean_2 PRIVATE CGAL::CGAL CGAL::CGAL_Qt6
+                                                      Qt6::Widgets)
+
+add_to_cached_list(CGAL_EXECUTABLE_TARGETS Boolean_2)
+
+include(${CGAL_MODULES_DIR}/CGAL_add_test.cmake)
+
+cgal_add_compilation_test(Boolean_2)
+

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@@ -0,0 +1,57 @@
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